If Bitcoin is still subordinated, they will establish the framework that all countries are trying to establish. If they succeed, then surely altcoins will take decentralization into their own hands and will not be allowed to remain without the most important thing. Therefore, I think that there should always be bitcoin, even if not it, then one of the altcoins in its place. A forerunner is always needed.
Governments will not be so naive and stupid as to restrict only Bitcoin itself. If regulations are introduced or even a ban is introduced, it will happen for all cryptocurrencies, and not just for Bitcoin.
I think an interesting situation can happen in China, because there the government wants to introduce its own cryptocurrency, and when it does, it is very likely that it will ban all others.