At this point, I think it's safe to say that Bitcoin is "immortal". What governments will be able to do is shut down centralized mixers and exchanges alike. But the core Blockchain network will remain alive for the foreseeable future. This is is only the beginning. Who knows what will happen in the long run?
I agree that Bitcoin won't die, but rather it will go the way of the IBM mainframe: still a big business, but not the "mainstream" thing like it was.
Bitcoin not the last word in digital currencies, it's just the beginning.