There isn't supposed to be a "future" in mining... it's all supposed to go to Proof Of Stake instead if you believe the crypto pundits. I don't personally buy it... the Ethereum group doesn't seem to be able to pull it off. Hell, they can't even get the token transaction fees to something reasonably low, and that's been a problem for over a year now.
It's a bit more complex and nuanced than this. As someone that follows the space closely, especially Ethereum, I think many will be surprised with how the next year goes for Ethereum. Yes, progress is slow, but it's moving forward and the merge will happen sometime spring/summer of next year.
As far as fees, they're just a function of available blockspace and demand. Demand has been through the roof and driven extremely high fees. Ethereum devs have gone pretty extreme on not willing to compromise decentralization as a way to increase throughput.
Rollups are the short term game plan for scaling and corresponding low fees and while Optimism and Arbutrum are live they're in their infancy and don't have CEX bridges yet. ZK rollups will be live starting with Starknet in the coming month or two and I suspect that by the end of 2022' Ethereum will have both scaled massively and moved to Proof of Stake.
2023' will be the move to sharding which will multiply existing L2 scaling by 64x to begin with.