1PH dominated by like 4 pools (pretending to be 6) is a concern. 1PH with individual miners constructing blocks themselves, that doesn’t worry me.
Don’t make the mistake of thinking simple scale will protect a highly vulnerable structure.
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There will always be 2-4 large pools. That's the nature of mining incentives. Bigger pool more likely to get reward. Pool too big, reward is too diluted. It's a self regulating system. Real proof of work, not some BS uPOW. I don't forsee pools being a problem or mining centralization being a problem in Bitcoins system.