I did not shut my farm down only because i am heating all the building with that generated heat. In other case it would be stupid to mine only on hope that one day cryptocurrencies will rise again. I can understand that when you do that with $2k worth of equipment, but when you mine with $100k, you also thinking that you wearing your equipment for no ROI. So in this case it is better just to shut the farm down and wait for better times to come.
As noted this is not such an issue for people with 1 or 2 cards who were casual mining. People who took out $10k or $100k loans really have to consider the adverse effects of waiting. If the next coin boom doesn't occur for 2-3 years then good luck trying to unload 3GB or 4GB cards when 16GB cards (possibly on 7nm) become necessary for 4k/8k displays. Even if the cards aren't mining they typically go down in value.
Personally I dump my cards as soon as I can or when a new efficient node is being released. December 2017 gave some pretty clear signs it was a good time to exit mining.
Those veteran Radeon 4870s that were first mining BTC back in 2010/2011 never returned to see mining again.
1080Tis should be safe, but I don't think RX 470s and 3GB 1060s should be held.
