[vidarh]

Well, no, even that isn't a problem, because you can run a Wayland compositor on X too.

E.g. I tested, and Firefox runs fine in Weston in kiosk mode w/X as the backend.

So even when Firefox drops X, it will still run on X as long as a single compositor with an X backend is still running.

[Vecr]

Great, my Firefox on Weston on i3 on XWayland on Gamescope idea is a go (when I get around to implementing it).

[vidarh]

The funny thing is in theory it might work reasonably well, as Weston at least uses the DRI3 extension to get the underlying X server to just pass the DRI filedescriptors up, so if the rest also supports it you'd in theory just get a game of passing the fds through multiple layers and then the client doing direct rendering via shared memory. Though in practice there's of course plenty of things that might go wrong.