Wayland support
This is probably going to be a huge task and I don't expect it to happen any time soon, but at some point, in some future release, we're going to need to support Wayland. A X.org maintainer recently posted this [1]:
Once we are done with this we expect X.org to go into hard maintenance mode fairly quickly. The reality is that X.org is basically maintained by us and thus once we stop paying attention to it there is unlikely to be any major new releases coming out and there might even be some bitrot setting in over time. We will keep an eye on it as we will want to ensure X.org stays supportable until the end of the RHEL8 lifecycle at a minimum, but let this be a friendly notice for everyone who rely the work we do maintaining the Linux graphics stack, get onto Wayland, that is where the future is.
The good news is that RHEL 8 will have maintenance support until May 2029 [2], therefore so will X.org. It could even be a little longer with Extended Life-cycle Support (assuming updates will be made public).
[1] https://blogs.gnome.org/uraeus/2019/06/24/on-the-road-to-fedora-workstation-31/ [2] https://access.redhat.com/support/policy/updates/errata/#RHEL8_Life_Cycle