well the good (or bad, depending on how you see it) news here is you also couldn't use prorender (at least not seriously) if you had an up to date gpu :D
but i feel you, i was planning on building a hackintosh with a bunch of 1080ti's in it, but i think i will have to delay that endeavour a little until the bitcoin bubble bursts. i don't think it will take that long anymore until people notice the train has left the station a long time ago and it costs them more money than they can make with it. it's a hype, and hypes usually have a rather short lifespan.
on the other hand, if i'm wrong and it's not a hype and it's becoming a long term thing, gpu manufacturers will develop more cards perfectly suited for miners and gaming cards will become available again. and if that's also a wrong assumption and the demand of gamer cards stays that high, manufacturers will produce more and more of them, and they will also become available again to everyone at normal prices. it's just a matter of time until everything pans out again, the market just needs some time to adjust to new and unexpected situations.