I hope this won't happen, I just start mining January 2021 with my new graphic cards, I've not even make half ROI back yet, this will break me if bear market starts this soon, I was expecting something around June or July, though I have free electricity since I'm using green energy but I have my targets
If you bought 3080 for less or equal than 1k or 3060/3070 for less or equal than 800 usd then you will be fine, people buying 3060/3070 for 1400 usd and 3080 for 1800 usd or 3090 for 3k then they will be hurt pretty bad.
I bought my gpus for 400$ and they produce 31MH each, hope I'm on the safe side? 120 to 150 days is all I need to recover my most ROI, it's definitely going to be a disaster if bear season really kicks in right now