[fleddr]

Because Bitcoin is mined on ASICs. It's not a graphics card, instead a single chip optimized for one function only: mining (by generating hashes).

GPU based mining is mostly done to mine Ether. Ether will switch to Proof of Stake somewhere in the next 1-2 years, after which the competition between gamers and miners for GPUs will end.

[marktangotango]

That's the optimistic outcome, the pessimistic outcome is the miners will fork "eth-classic" and keep going. It's up to the reader to decide which is most likely, or both.

[StillBored]

Or they will move to some other coin that is rising in popularity and doesn't have GPU resistance built in. The latter is something that feels like a negative these days if you want a lot of buzz about some new crypto tokens...

[fleddr]

My understanding is that miners are on board with the new Proof of Stake system of ETH 2. Holders even more, as it will reward ETH to ETH holders.