While I agree with your assertion that governments have no reason to support Bitcoin, I don't believe it follows that government sponsorship is necessary for the success of Bitcoin. I suspect most people betting on Bitcoin are aware that at some point, governments are going to act forcefully to kill Bitcoin, and the fallout will be utterly unpredictable.

But, I don't think it's something that can be put back in the bottle. We're crossing into uncharted waters here. Nothing like Bitcoin has ever happened before...so, we don't know how it's going to play out. I'm bullish even with the expectation that major world governments will collude with current financial elites to kill Bitcoin, because I suspect there is no way they can actually kill it.