It's solvable over the course of, what, two years, with a big lobbying effort, intense pushback from those who disagree with the solution and prefer another one, and painfully slow coffee-drip client propagation. (Don't forget Primal, which you mentioned, is still on NIP-04).

And that's assuming it gets adopted at all.

Async server-side transcoding in a verifiable hash environment in a system that doesn't have any sort of holding pen (because there is no central authority to hold stuff) is just really complex. Remember when MLS was supposed to take just some months and have libraries that'd make it easy for any NIP01 client to integrate, and by now we'd all be enjoying MLS groups in our Damusus and our Primals?

Look this stuff is years and years, I'll call anyone's bluff that says this is just a "few months" of friendly zoom calls and clacking around on the keyboard.