The more genuine question should be what if Bitcoin gets legalized in every country of the world and gets accepted in all countries of the world? That would be a dream come true experience for most Bitcoin lover and then one will not worry about the centralized systems and one will not always have to rely on centralized systems.

But, who knows if that becomes a reality one day then in order to buy or keep Bitcoin one might have to get permission from the governments and also one may have to declare the wallets that could be used to keep Bitcoin. The centralized system won't allow everyone to be free from the bondage of centralization and thus they will do something by then if Bitcoin becomes fully regulated and accepted in all countries.