I'm surprised who would still be buying it. considering you never know when eth team would pull the plug on it after they receive a unit. I just feel its kind of risky to buy them with shady business practice of bitmain going from 800-2200 you never know when the price drop might come
Even if Ethereum switches over to POS, there are there are other coins that use ethash. Check whattomine.
Now, where will all those GPU farms point to after Ethereum changes over to POS.
And if you total the network hashrate for all of them *COMBINED*, I'm pretty sure they are well under 20 percent of Ethereum total network hashrate.
There is also the factor that by the time ETH goes full POS, there will be at least one new "even more efficient" generation of cards out from Nvidia, might be a new generation out from AMD, and the E3 is already going to be struggling to compete before the big "profitability falls off a cliff" event happens that the move to full POS will cause.