Here's what could really shift the future of American cities away from San Francisco, New York, and Boston

[youtube http://www.youtube.com/watch?v=DWXR0MF07H4&w=600&h=315]

You could choke a horse on the Internet with lists about the "best city" or the "future city" of America -- Pittsburgh, Indianapolis, Salt Lake City and others have all topped different lists -- and now there's a new study out on youth population, but not really "youth" as in 23 year-olds -…