Fusion is not going to be commercially viable anytime soon but that's not the point. Whether how and to what we transition is a political choice, if fossil fuels are too cheap for renewable to compete, you tax carbon fuels more. Renewables mostly everybody is ok with however have the problem that don't produce power consistently and on demand, that's where nuclear power comes in to fill that gap and hopefully in the future fusion. If we dislike the nuclear waste problem enough, we'll have to pay up to make fusion a financially viable alternative.