Can I buy bitcoin from you today, person-to-person, without risk of being kidnapped (arrested), under threat of violence, and then thrown into a metal cage (imprisoned)?

If the answer is no (and for 99% of the world, the answer is legally, no), then you raise a very good question -- we just don't know the future.

I suspect there will be hyperdollarization occurring first, see this article:

How The United States Weaponizes The Dollar To Retain Global Hegemony #87171 https://bitcoinmagazine.com/markets/weaponized-us-dollar-for-global-hegemony

And then when a government is no longer trying to protect their ability to print (i.e., inflate) their own money, then they will flip and support bitcoin adoption. That's why we see El Salvador (which has no fiat currency of its own) and Central African Republic (which uses the CFA currency scheme, and not its own currency) granting bitcoin legal tender, and countries like China (which is trying to become an alternative reserve currency) have significant restrictions on bitcoin.

So your question might first be ... will the transition away from non-dollar fiat currencies be violent or peaceful? And for that again, we just don't know the future -- but to speculate based on history, loss of the power that the printing press provided creates a vacuum, and violence following that occurring is not uncommon at all.