I have a weird personal inclination that, as the Bitcoin fiat value continues to increase, it might push people to draw back on spending Bitcoin. And we may not hit a full Bitcoin Standard if people do not readily spend Bitcoin for things.

And for countries, I think the most they'd do is to make Bitcoin a reserve asset. Going Bitcoin Standard for countries will mean that "Politicians will no longer print money with their friends,". I doubt if they'll ever give that up.