A set of merge requests were opened that would effectively drop X.Org (X11) session support for the GNOME desktop and once that code is removed making it a Wayland-only desktop environment.
Going along with Fedora 40 looking to disable the GNOME X11 session support (and also making KDE Plasma 6 Wayland-only for Fedora), upstream GNOME is evaluating the prospect of disabling and then removing their X11 session support.
Some concerns were raised already how this could impact downstream desktops like Budgie and Pantheon that haven’t yet fully transitioned over to Wayland. In any event we’ll see where the discussions lead but it’s sure looking like 2024 will be the year that GNOME goes Wayland-only.
I have to research more thoroughly what the promised advantages of Wayland are, but from what I’ve heard is that the capability system is much more secure and the architecture is more decentralized, not a single server which takes everything down with it when it breaks.
Anyways, Wayland has a LOT more growth behind it. X is in the process of being deprecated. So I’m pretty sure Wayland must be better in some general way, otherwise it couldn’t have gotten this momentum.