As you'd guess, this could do a lot to transform medicine. You should be that much more likely to catch an inherited condition before it becomes an emergency, giving you a chance to mitigate the effects. It should be cheaper and less burdensome, too -- doctors could test a whole family one time instead of watching it for years to see if heart problems crop up in more than one person. This won't spare you from having to take medicine or change your lifestyle, but it could prevent a tragedy.