With the recently completed Ethereum PoS merge, the coin would effectively become unmineable via GPUs some time in 2023. However, an immediate GPU dump is unlikely, as new PoW alternatives including Ethereum Classic or the newly-created EthereumPOW hard fork still see considerable support from certain large GPU mining players.https://www.notebookcheck.net/Ethereum-completes-PoS-merge-but-GPU-based-ETH-mining-is-not-dead-yet.652618.0.html
"Nvidia and AMD are now offering most of the current gen GPUs at lower-than-MSRP"
No. Even if this were true, "lower than MSRP" does not mean "lower than initial MSRP" and in particular not "considerably lower".