I believe the science currently exists to solve some of the bigger issues, but not necessarily the technology or proof of concept.
A molten salt Thorium reactor probably can be feasible, but there's not a full working example of one yet. Then there's the question of economics; can they be built such that the cost per unit energy delivered is economical?
That all remains to be seen, and I expect the future will answer those questions, but at the current moment things are uncertain.
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