IT’S NOT THAT you’re getting smaller. It’s that automobiles are getting bigger.

Last week Ford announced that it would wind down U.S. production/sales of passenger cars—excepting its Mustang and the sort-of-sedan Focus Active—in favor of more popular and profitable trucks, SUVs and crossovers. By 2020, 90% of Ford’s North American sales will consist of larger vehicles with lower fuel economy, because nothing bad ever comes of that.

Ford...