I believe the ever-declining affordability of driving is going to decimate real estate in the US. We have upwards of 80 years worth of home construction designed almost exclusively around the ability to drive. With the assumption that cars and fuel would forever be cheap and that the Federal government would continue to heavily subsidize road construction.

I'm curious to see how people solve this problem. Wealthy people can afford to move into urban centers to save money on commuting costs, but relatively poor people will be stuck in the old suburbs. I suspect motorcycle-class vehicles will begin appearing from upstart manufactures which are effectively single- or dual-seater three wheelers with closed cabins that are cheap to purchase and operate.