Erwin Chemerinsky, the dean of the School of Law at the University of California, Irvine, is the author of "The Case Against the Supreme Court."

(CNN) As the nation is stunned by the death of Justice Antonin Scalia, the immediate question is what it will mean for the Supreme Court this year and in the future.

The court has an unusually large number of cases before it this term on controversial issues: abortion, affirmative action, the contraceptive mandate in the Affordable Care Act, the First Amendment rights of non-union members, immigration and voting districting.

The long-established procedure is that for a justice to participate in a ruling, he or she must be on the bench at the time the decision is handed down. Justice Scalia's vote, therefore, will not be counted in any case this year that has not already been issued. Obviously, in any case where there is a majority without him, the decision still will be forthcoming.

But there may be a number of 4-4 ties without his vote. For example, the Supreme Court heard oral argument in January in Friedrichs v. California Teachers Association as to whether to overrule a prior decision and hold that non-union members have a First Amendment right to not pay the share of union dues that goes to support collective bargaining.

Photos: Today's Supreme Court The justices of the US Supreme Court sit for an official photograph on June 1, 2017. In the front row, from left, are Ruth Bader Ginsburg, Anthony Kennedy, Chief Justice John Roberts, Clarence Thomas and Stephen Breyer. In the back row, from left, are Elena Kagan, Samuel Alito, Sonia Sotomayor and Neil Gorsuch. Hide Caption 1 of 10 Photos: Today's Supreme Court In 2005, John Roberts was nominated by President George W. Bush to succeed Sandra Day O'Connor as an associate justice on the US Supreme Court. After Chief Justice William Rehnquist died, Bush named Roberts to the chief justice post. The court has moved to the right during Roberts' tenure, although Roberts supplied the key vote to uphold Barack Obama's Affordable Care Act. Hide Caption 2 of 10 Photos: Today's Supreme Court Anthony Kennedy was appointed to the court by President Ronald Reagan in 1988. He is a conservative justice but has provided crucial swing votes in many cases. He has authored landmark opinions that include Obergefell v. Hodges, which legalized same-sex marriage nationwide. Hide Caption 3 of 10 Photos: Today's Supreme Court Clarence Thomas is the second African-American to serve on the court, succeeding Thurgood Marshall when he was appointed by President George H. W. Bush in 1991. Thomas is a conservative and a strict constructionist who supports states' rights. Hide Caption 4 of 10 Photos: Today's Supreme Court Ruth Bader Ginsburg is the second woman to serve on the Supreme Court. Appointed by President Bill Clinton in 1993, she is a strong voice in the court's liberal wing. Hide Caption 5 of 10 Photos: Today's Supreme Court Stephen Breyer was appointed by Clinton in 1994 and is part of the court's liberal wing. Hide Caption 6 of 10 Photos: Today's Supreme Court Samuel Alito was appointed by President George W. Bush in 2006 and is known as one of the most conservative justices to serve on the court in modern times. Hide Caption 7 of 10 Photos: Today's Supreme Court Sonia Sotomayor is the court's first Hispanic and third female justice. She was appointed by Obama in 2009 and is regarded as a resolutely liberal member of the court. Hide Caption 8 of 10 Photos: Today's Supreme Court Elena Kagan is the fourth female justice to ever be appointed, and she is counted among the court's liberal wing. She was appointed by Obama in 2010 at the age of 50. She is the court's youngest member. Hide Caption 9 of 10 Photos: Today's Supreme Court Neil Gorsuch is the court's newest member. He was chosen by President Donald Trump to replace Antonin Scalia, who died in 2016. Hide Caption 10 of 10

The court will have two choices in these cases. One possibility is simply to announce that the court split 4-4, which means the lower court is affirmed without opinion by an evenly divided Supreme Court.

This would mean that the lower court decision in favor of the unions would stand, and in the abortion and immigration cases this would leave in place lower court rulings in favor of the conservative result. Or the court could decide to put these evenly divided cases over for reargument next year.

But will the court have a ninth justice next year? The crucial question is whether President Obama can nominate anyone that the Republican Senate will confirm. President Obama will likely want to appoint someone who will shift the balance on the court; he does not want to appoint a conservative just to get someone through the Senate. But it is doubtful that anyone acceptable to Obama could get the support of the majority of the Senate.

My prediction is that President Obama will pick someone quickly of impeccable credentials. The Senate will have to decide whether to confirm or leave the seat on the Supreme Court vacant for more than a year. Senate Republicans likely will choose the latter course, even though it may make them vulnerable to criticism in an election year.

If the vacancy remains until after the presidential election, even if the new President picks someone immediately, it is unlikely that the confirmation process can be done much before the end of the next term. This would mean the court would function with eight justices for the rest of this term and all of next.

All of this ensures that the Supreme Court will be a far more salient issue in the presidential election. And it should be. This seat on the Supreme Court could make all the difference with regard to virtually every constitutional issue and affect all of us, often in the most intimate and important aspects of our lives.

Antonin Scalia served on the court for almost 30 years and was a consistent conservative vote and a powerful conservative voice. He staunchly opposed abortion rights and affirmative action; limits on campaign spending, gay rights and separation of church and state. His long-term legacy in these, and all areas, will depend on his successor and who fills other likely vacancies on the court over the years to come.

Since 1960, the average age of a Supreme Court justice leaving the bench is 79 years old, Justice Scalia's age at the time of his death. Three other justices will be 79 or older in 2017, the year in which the next President is inaugurated.

The most important issue in the next presidential election should be, and now is more likely to be, who will fill these vacancies.