There will not be "limitless fusion power". There will not even be "limited fusion power". What there is, in their place, is defrauding investors. There is pl

There will not be "limitless fusion power". There will not even be "limited fusion power". What there is, in their place, is defrauding investors. There is plenty of that. (NRGV, e.g.) Such investors are supposed to be able to look after themselves, but often enough they are pension funds managing what is supposed to be people's retirement money. In short: yes, deuterium is cheap, relative to the energy available from fusing it. Even tritium is cheap. But actually extracting that energy in usable form is extremely expensive. It is, in fact, overwhelmingly more expensive than extracting energy from fission. And fission is not competitive. Existing fission plants will be mothballed as their output is undercut by renewables to the point where no one will pay enough for it to support continued operation. Renewable energy is not at that point yet, but its cost is still in free fall.