Same here, I also think that ETH miners don't have to fork ETH when it shifts to POS.
Not ETH Miners but others could fork.
The only thing that came in my mind when they fork ETH is nothing but another money grab since it is free money for ETH holders.
If someone forks it with SHA-256 via merged mining, there are no additional costs for Bitcoin miners. I'm surprised that someone hasn't already done it. And that may be why no one will do it in future.