Red Hat has formally confirmed what many were thinking: Red Hat Enterprise Linux 10 will be doing away with X.Org Server support aside from XWayland.
For those making use of the Red Hat Enterprise Linux 10 in a desktop setting, RHEL10 due for release in H1’2025 will be Wayland-focused. X11 client support will only come via XWayland.
This does also further solidify the X.Org Server in effect being dead upstream. Red Hat engineers were typically the ones managing new X.Org Server releases as well as carrying on with various bits of development.
For many uses, Wayland has feature parity now or is even the superior option. That is how it can be the default on so many systems ( including RHEL9 as per the article ).
Compositors that do not provide the features that uses want will fail to compete ( what you mean by become useless I assume ).
That said, different users will want different things and, unlike X, Wayland allows competing compositors to address different communities. Some compositors will lack features some users want while offering features that other users need. A composite targeting embedded use cases may not need multi-monitor or fractional scaling features for example. A security focussed option may think that global hot-keys and external lock-screens are anti-features. I think the Wayland world could be quite interesting.