Once bitcoins are declared illegal, all of the statist chickenshits--and there's a lot of them on this forum--will pee their pants and sell out. This will hurt the price for sure. But there will remain a market for bitcoin because a) it's time has come and there will be too much demand and b) there will be a surge of interest in online anonymity, which will become much more common than it is now. (This will be difficult for mobile apps, btw.)
It's once exchanging BTC for fiat is declared illegal that most people will exit the bitcoin "market".. which is just as well anyway. The sooner the speculators leave, the sooner there will be a majority exchanging BTC directly for
goods and services instead of trade ecxhanges whose aim is to accumulate fiat.
As far a bloody armed rebellion over BTC? Sounds like a Randian Libertard's idyllic wet dream, and therefore a reality which is exceedingly unlikely to ever come to pass. Bitcoin (or something very like it) has a niche in world commerce for the foreseeable future, but that place is not likely as a catalyst of revolution of any kind.