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if you can power them, cool them, and connect them up in a useful way.

Good luck with that. Power costs go up linearly at best with cores if you don't have any more transistor scaling.

Power will always scale linearly with cores, of course, but you could make cores less power-hungry with reversible computing: https://en.wikipedia.org/wiki/Reversible_computing

Actually useful reversible logic is, as they say, an open problem.

My point was that a new transistor shrink would give you lower power vs. the same transistor in previously larger node. You get more compute-per-watt with small transistors. If scaling stops, then all kinds of things get more difficult.

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