If it wasn't mining, it would be companies like Facebook, Microsoft, Google, Apple, etc etc buying up all the stock to train their AI algorithms.
In all honestly gaming is one of the least important and wasteful uses of these cards. The demand for them for other causes will just grow and grow, and gamers are going to remain at the bottom of the list of the market. The only change will be when this VR metaverse starts to take hold, but that won't be for a couple years at least, and the demand in the AI, and enhanced problem solving like mining won't drop a bit.
They're going to continue to get more expensive, the best bet is to make less graphic intensive games/more efficient graphics engines. Or cough up the cash. As long as these graphics cards keep improving at a rate equal or greater to the performance of TPU/NPUs, the other fish in the market will be much larger.