There is no assurance that Bitcoin will stay in the next 100 years. We never know what will happen in the future. There is a possibility that government will have a all through out battle against Bitcoin and ban it everywhere, or accept it as mode of payment or legal tender. We really never know what will happen in the future so whatever benefits we have today with Bitcoin, lets just enjoy it and hope it will last.
Well, if the government see that engaging in Bitcoin is profitable for their citizen, and lessen the financial burden of the government, they might engage with Bitcoin positively and probably lead in Bitcoin adoption.