Yeah, idk why everyone seems to legitimately think devs are going to just quietly revert back to usermode anticheat. I could see Riot patching an actual root kit before that happens.
But yeah, more likely MSFT will lobby for hw that is more annoying than secure boot or TPM to get working with linux, every windows app after that point will rely on it “because turnkey security!”, and if you ever manage to disable it none of those apps will work on your machine in any OS (if they even worked through proton at all).