Even with the abundant energy harnessed through fusion you would still need to manufacture the ASIC miners to obtain a significant hash rate. Also, if fusion energy becomes viable the most effective and long-term way of putting the energy to work may not be related to Bitcoin.
Abundant energy is bound to have a major role in a field as competitive as mining. As far as ASICs are concerned, you're right but, still trying to look into the future, isn't there a time when a hypothetical technology could make mining much more efficient and create a centralization of the hashrate. That's kind of the idea
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