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It could come back to CPUs again, using a ASIC resistant algorithm.
It is a much more democratic and decentralized approach. A return to the roots.
What are some ASIC resistant algorithms?
Any algorithm that I can think of that can be executed on a CPU architecture would probably be more efficient when run on an ASIC, because it's built specifically for that algorithm.
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Take a look at Monero. They were able to achieve the outcome of CPUs being the best choice for mining.
While the previous algorithm (Cryptonight) had the same purpose, ASICs eventually started to appear. However, a few years ago they changed the algorithm to RandomX, and since then, there are no signs of ASICs being used. CPUs are the best choice to mine Monero.
Extra: This answer might also be helpful to get a picture of how it works.
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