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> The network hash rate is only so high because the ROI is there, but without it, people would still be mining.

Can you expand on that? What would be the incentive for the miners then? What happens when all blocks are mined?

You never mine all the blocks, and regardless of the reward there is always a transaction fee which incentives mining.

Regardless though my point about space heaters was that 'being warm' is enough incentive for some people to mine crypto.

If ROI goes down, fewer miners will mine. When all blocks are mined, transaction fees will be the main source of incentive to mine.