Raising prices only works when there is no competition. If crypto-mining crashes, there will be millions of retired mining GPUs flooding the market giving people who refuse to pay $400+ for a GPU plenty of options.
It would be stupid to buy any card that was used for mining, they run 24/7 at high temps, basically they are abused cards with a high rate of failure. So tons of crypto mining cards flooding the market is no help. This has already happen once back when Chine outlawed mining.