Yesterday (May 12th) some GPU miners did a test migration moving their rigs off of Ethereum to see how things might change once the Merge happens. I doubt that enough people switched to see anything significant on the networks, but who knows.
For me, it was an opportunity/excuse to see what I personally would do, and I chose to switch to Kawpow for the day. I just finished writing my initial reactions in the ProHashing
GPU-Mining discord channel.
The basic feedback I can provide was on the older card (2060) the efficiency to run newer algos like Kawpow was just not there. On the single card the electric cost went up $0.27 for the day, while earnings went down $0.14. I simply could not (under current conditions) get that card to be profitable to run.
I also have some 3060 TI's, and while the overall profitability of them was able to remain above water on Kawpow, the total profit per day dropped from $8.98 (two days before) to only $1.93 under Kawpow - but at least they were still making money.
So I don't know that (for mining) older cards can have a future of any kind. Even trying to bridge them, if the underlying power is not efficient enough to be profitable, it won't help. Unless you have no expenses to run a rig (free electricity, cooling, internet, etc.) then you have to consider the efficiency of cards - and if it is free, then even making 0.8MH/s is 100% profit so may as well run it at that level.
This post, and my tests, inspired me to start writing a post about profitability post merge, that I will put up later today.