Solar fusion isn’t a thing that exists as a technology (If anything, you’re referring to the nuclear fusion in the core of a sun).
Nuclear fusion is a technology that does exists, but it’s only just barely able to break even in highly experimental test setups. It does not reverse entropy.
You just simply can’t reverse entropy, not matter what technology you use. It would violate the second law of thermodynamics. You can decrease entropy by moving a place with less entropy to a location with more entropy, but somewhere entropy would still increase more than you decreased it in the other place. Everything lost to heat is permanently lost.
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There will be new technologies yes, but none of them will perform miracles like you seem to think they will.
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