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I think his belief is that even if hash rate halves, it is still difficult to 51% attack.
And maybe that non industrial miners will become an increasingly large share of hash power.
The 51% threshold isn't a fixed hashrate number but the marginal cost of assembling and sustaining the attack capacity. Difficulty drops hand more revenue to efficient survivors, and those operators (industrial or otherwise) also tend to sit behind better power contracts and hardware. If fees stay sub-0.5% for years, the bigger risk may be gradual centralization among the lowest-cost players rather than a sudden hash drop enabling cheap attacks.
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Bitcoin mining always rebalances, and the design is brilliant in that sense.
The concern though is that if the real rewards of mining get smaller, so will the total hashrate, making the network more vulnerable to 51% attacks.