>>paulpa+(OP)
Don't forget that the Obama administration had the Cash for Clunkers program that destroyed the engines of the cars that were turned in. It did take a bunch of guzzlers off the street, but it also stripped away a large number of cars that might be in the used car market still (it ended in 2009, so some 15-year old used cars are not part of our world.
Big part of the issue? Probably not. Contributor? I expect so.