What can stop Bitcoin now?
A big ass meteorite, the sun going nova and maybe Global Thermonuclear War.
Oh you mean realistically? Another cryptocurrency which is superior in a way I obviously do not know (else I would create it). I'm pretty sure cryptocurrencies will be around for the the long run.
+1
Whether it's Bitcoin or something else, this new technology has trumped the dollar in every single way.
Only question is, how much kicking and screaming should we expect from fiat?