In my opinion - bitcoin is not mandatory for every country to legalize as a legal currency, but legalizing it to a certain extent is enough. I mean - the government does not need to adopt it as a means of payment - but legalizing trade and investment alone can make them get state revenue. The state can tax the profits of traders or investors - that is certainly beneficial, but of course it would be even better if they also adopted it as a legal means of payment.

I don't expect all countries to adopt bitcoin as legal tender - but I expect regulations to become more bitcoin-friendly rather than banning it. The more countries that support bitcoin - the better the future, that's what I hope.