When the price of electricity is higher than the mining payout, the hash rate will again plummet. Even though hashing with ASICs is much more efficient than CPU

When the price of electricity is higher than the mining payout, the hash rate will again plummet. Even though hashing with ASICs is much more efficient than CPUs or GPUs, it still takes electricity. And if the transaction rate remains low, the payouts are going to be smaller and smaller. Mining capacity should act like a utility company that spins up and down power stations in response to demand for electricity. Mining slows until transactions payments go up enough to make it worthwhile. (And that doesn't even cover the fact that mining is still a lottery for the pools).