Coins have been dodging ASICs for years by changing algorithms. If Eth wanted to they could just
change the algorithm to bypass the Nvidia block, repeat when necessary.
LHR is really just a marketing gimmick to shift the blame to miners for the GPU shortage.
If ETH went the route and actually did a fork just to get LHR cards working again then I am pretty sure it would lose tons of its value. Remember when they were suppose to switch to ProgPOW to get rid of ASICs, remember all the controversy that was brought up, especially by the ETH maxis?
Then they spent all the money, did a hardware and software audit, which came out positive. Then they decided not to do ProgPOW anyways. Then they for some reason said they will include ProgPOW, then all of a sudden it was removed from their EIP.
So I am pretty sure they will never change their original DaggerHashimoto algo.