I think miners have to know and care about a fiat exchange rate, at least until electricity can be paid for in BTC. So that's where I thought a threshold for mi

I think miners have to know and care about a fiat exchange rate, at least until electricity can be paid for in BTC. So that's where I thought a threshold for miners running their equipment without losing money might come from - and thus a never-come-back dropdown limit. I really don't know, just curious. But probably automatic adjustment takes care of this, as you said.