Bitcoin is designed to handle fluctuations in hash rate. If the hash rate falls due to some miners going out of business the difficulty adjustment will kick in and it will become more profitable for the other miners. As the fiat price goes up, more miners will re-enter the market. We don't need to change a system that's already working.
System is working only because of NGU in the "early" phase. Overtaxed active users will not pay endlessly for the whole network security, i.e. for "free lunches" for passive parasites :)
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