Ethereum is easy to change (hard forks often) and so cannot be expected to preserve any key characteristics like emission curve or even the permissionless nature.
In fact, Ethereum's monetary policy did change in the past.
This will get you nowhere. Already, Monero successfully employs general CPU-s for its PoW. Bitcoin could switch to another PoW algorithm if critically necessary. Decentralized cryptocurrencies are beautiful hydras.
You are absolutely right but it gets even worse. The KYC bullshit is on the brink to spill over to non financial services, like messaging apps, hosting, email, and what not.
In fact, Ethereum's monetary policy did change in the past.