How many mining GPUs do you think will still be good for gaming when everyone decides to quit mining ETH and sells them? Do you keep this in mind when overclocking yours? Or do you push them as far as they will go?
First, mining will go on for a while, for as long as there are cryptocurrencies...they will just mine another one.
But when miners move to the next BIG, GREATEST GPU, from what I'm seeing, there are not enough gamers in the world to buy all the used GPUs.