I recently contemplated with a friend, what will be the next "underground" sport to be "co-opted?"
skateboarding, fixed gear bikes, what's next?
her answer: FREE RUNNING

granted, I dunno how this will work, given that there isn't really equipment for it that can be marketed, but I'm sure someone will come up with some special shoes and bring back the term X-TREME (spelled as such) from the 90s and soon enough everyone will be jumping across buildings and glorified fixie subculture will be forgotten and put back right where you want it.