I don't think the supply issue is going to be solved that soon. I'd be glad if I'm wrong though. Buying secondhand card is now as difficult as buying a new card. It's hard to upgrade my old pc.
Well if market drops down to 2 cents an mh miners will dump cards.
I set up a client with five nine card riser less rigs. he got the gear in feb. 3070 cards
45 x 1200 = 54000 in cards add the other parts. he paid just under 58k he mined for about 150 days
the best days he made 550 a day the money now is 165
his power is 13 cents he burns 168 kwatts a day about 20 bucks.
so he is done to 140 profit from 530.
at the moment he could sell them at 1000 get maybe 45k for the setup and he made a lot mining.
all over the world there are people with higher power cost like him.
all that needs to happen is a drop to 2 cents an mh and a ton of people like him will dump the gear.