2k-3k is the floor.
there is a real reason for those numbers.
at least 40% of the hard iron mining is used to help power plants load level when they have excess power.
Hydro power does not get turned off during rainy season.
excess power is used mining equipment
I consulted on a 100megawatt project for a mine that was surround by 5 major power plants they go from 40 to 100 megawatts depending on the power plants excess power.
This causes a real value for btc or bch since she 256 gear is the most common gear around. do you want to say btc drops to 100 then bch will rise to 3500 k since it will use the gear. to level the loads.
This explains why miners won't shut down (at first, anyway) but it doesn't guarantee the market will actually pay them $2-3K per BTC to keep mining. Let's say hypothetically that demand drastically falls and there are no buyers left who will pay above $100. What then? There may be perceived value in terms of proof of work, but what "real value" is there if buyers aren't willing to pay for it? It seems like difficulty should just plummet to meet user demand.
I don't expect $100 either but it's not based on miner expenditures.