Much more important concern than mstr owning lots of BTC. However I don't see how a fork forced on my governments is much of a concern. Especially if by that time they have a considerable amount of wealth in BTC. Seems very risky for them. Also, the large governments would likely have to colude in order to take away enough hash power assuming the miners agreed and didn't just get up and leave for somewhere else. Definitely a good thought experiment though and we for sure need to watch out for this. Government and large fund managers are not going to like the lack of control. I think I could see them trying to do a hard fork over the fear of "quantum resistant addresses" as well.