rental cars are even remotely like the ones I have encountered recently, their existence should end with their useful commercial
life by law
. I don't know what the mentallity is, but people tend to thrash and trash cars that are not their own; this seems especially true of "higher" performance machines.
I would never, knowingly, purchase a used "rental" car, and have counseled friends that they should make inquiries about the history of any previously owned
vehicle they intend to buy.
That said, recyclability, standardization of components, and control placement would be the things I would concentrate on. Standardization, lower maintenance expenses (by virtue of uniform component availability), and tax incentives, might lower the cost to the point where recycling was more cost effective than selling the vehicle to the auction house. One less smoke blowing beater on the road.
Think London cab.
The old one wasn't that
The new one borders on
attractive ... in an odd sort of way.