Bitcoin is free for anybody to use and own. You can't want a free coin, controlled by no particular entity, owned by no particular person and then turn around and say "No, certain people shouldn't use Bitcoin". It goes against everything Bitcoin stands for.
I agree with this and for me this is a classical dilemma. (This is also an answer to @OgNasty.)
Of course, if a government wants to stack Bitcoin, he should not be forbidden to do that. And there is also no way to do that, as long as Bitcoin is censorship resistant.
As long as the governments only stack and don't interfere with development policy, everything is okay, but we can't guarantee that will stay this way all the time.
Some ideas if Bitcoin becomes a bigger than expected reserve currency:
- In many countries, you as a voter can influence what your government does with their stacked BTC. If they engage in something "scary", like a blacklist mechanism, show your opposition and be clear: that is not pro-Bitcoin policy!
- Support the Bitcoin OGs and cypherpunks in all discussions. I feel there are increasing attacks on them. You can of course have a divergent opinion with them, but the no-censorship aspect should be as holy as the 21 million limit.
- If things go terribly wrong, extreme measures like a hard fork could be an option. But of course only the last resort option. And the security of that chain may be a challenge albeit not impossible.