I think it can be worthless or not. I have 2 scenario about it, first if all government in world make consortium to banned BTC it can make BTC prices down and market panic. BTC is like gold in real world, right now used as the basic measurement of all crypto, 2nd scenario it can be future financial system (financial evolution) but this 2nd scenario have little chance to happen since as you know BTC/crypto are decentralized currency system and goverment can't control it. But who knows if government make special regulation about it, apply high tax maybe.