Looking at

https://etherscan.io/chart/hashrate

You can clearly see that almost everybody is powering up their rigs again. Pretty much as long as your power is $0.30/kwh or less, you are making a profit and this is based on the old RX series, some of the newer GPUs are even more efficient.

Hopefully this will last at least till Nov/Dec and not a couple weeks like last time when ETH boomed.