It doesn't matter what they will allow. What matters is what will happen.

Science fiction has explored the idea of transnational, nation-like organizations that have more real importance than an actual country. If nations reject bitcoin I suspect that is where we're going to go.

Fiction is an odd place to put the trust of your future wealth. Personally, I feel very confident that those who currently hold real power will end up on top. I.e. those with a powerful military and police force who are capable of enforcing actual change. Same as it ever was.

They can't enforce actual change if they can't touch it.

Tens of millions of voters own crypto now. Rational policy != feasible policy.

I think a ban is questionable and likely backfires for those in charge. Also banning based on what grounds? The US and many others see it as an investable asset.

Governments will likely start to buy/mine large amounts... that's seems more likely at this point.

I'd be surprised if the US government isn't doing this very soon (or has already)