Ford Motor Co. just marked the end of an era in the U.S. auto industry by announcing Wednesday it will stop building many of its well-known cars and instead focus its efforts on giving American drivers more of what they want: trucks and crossovers.

By 2020, only about 10% of Ford’s F, +0.22% North America portfolio will consist cars, which, according to Wolf Richter of the Wolf Street blog, poses a real problem when oil prices US:CLM8 surge and auto manufacturers are faced with scrambling to meet refreshed demand for gas-friendlier vehicles.