Prius people are the old people...of the future. With their compulsive lifestyles they'll be outliving us 2 to 1, no question about it. Just look at the sheer quantities of pineapple they consume.
I never thought I'd say this but I think we should just ban roads for the sake of the next generation. Or keep them if you'd want to let natural selection take its course in a more unnatural way. Street hockey just might be the most efficient solution to overpopulation.