Sanders economic stances are more the driver than his talks about universal healthcare. His talk about making college affordable, reigning in Wall Street, etc. are the main points bringing people in. Healthcare is not the main issue despite his support for it. The thing is, all the same factors that made it impossible in 09, are there right now. Scratch that--they're worse. Sanders would walk in with a Republican House of Representatives and a Democratic Senate--many of whom are owned by lobbyists from the health insurance industry. We're 5 to 7 years away from universal health care being feasible. I say that as that is the time table in which the districts will be redrawn.
At the moment it seems unlikely, but all that's really needed is to repeal the filibuster and reclaim the house and it's very possible imo.

