So, given progress we’ve seen in the last year or so, I’m expecting that X11 support for most (if not all) will go away in the next year or two. I don’t expect Plasma (or maybe Gnome either) to support X11 in their next major releases (aka Plasma 7.0, I would hesitate to put a # on the Gnome release, since they just keep incrementing).
The smaller and older DEs may linger for another release cycle or two, but I bet that’s about it. I saw recently someone say that X11 is on it’s last gasp, and I basically agree.
It’s been around a long time, darn near as long as me, but I think it’s only going to be a relic time-capsule soon.
Most of the hurdles have been overcome (as I think I said about 1-2 years ago), since the world finally started moving on. Otherwise, Wayland had been around for about seventeen years, but until it got shoved out of the nest to fly, nothing was happening fast, now it is.
Thoughts?
I have run Wayland 2+ years no issues nether programs or games.
I run KDE BTW.
Me too (on both).
I switched to sway (wayland version of i3) recently and am happy with the change. Wayland has made tremendous progress since I checked last time. It’s smooth and pretty stable now. I can see it will completely replace X11 in a few years.
Wayland seems to run perfectly on KDE and Gnome, Cinnamon seems to only have a few very small issues and XFCE is a joke. It seems X11 days are now limited. Haven’t tested Wayland on anything else.
I’ve been using Wayland for quite some years now. My setup is basic and straightforward (KDE, AMD), and my usage is rather simple (no games, no video editing, lots of ssh-sessions though 
) so I’ve had no problems stemming from using Wayland.
What I think may happen is that some major distributions will decide to stop working at servicing for X11 in a year or 2 or 3, with or without consulting their users base. Once that happens other distro’s will perhaps follow suit, whilst some distro’s will do all they can to keep X11 alive.
I’m not known for my predictive powers though, especially not so when trying to predict the future. And the older I get the more trouble I have to postdicting the past as well… So there is that.
I like Wayland using it on Kde. I could just as well use X11 on other desktops if Wayland isn’t mature enough on them. It doesn’t bother me. I think Wayland works better in a lot of instances but maybe not all. Well see in 2-3 years from now where things stand. I would like to see Linux become more mainstream. Windows is out! For most of us anyway.
Yes, I switched about 1.5 years ago when I made the switch from nVidia to Intel with my video card. Games are working great & I don’t miss X11 at all. Wayland was a real pain with nVidia & a breeze with Intel.
I’m with Gnome, so it was a very easy choice.
I’m not switching as such, but will move over once XFCE fully supports Wayland, assuming it doesn’t happen automatically.
I use KDE with Wayland and apart from the occasional mouse stuttering, it has been smooth and reliable. A lot of progress has been made by both the KDE team and Nvidia with regard to Wayland. I think it will still be a few years before X11 dies though.
Wayland, for me, is like logging into a gaming session because that’s its only use for me.
Otherwise, what my bio says. 
Au contraire, gaming is the hardest thing to do right (Wayland), so if you can do that (and yes the last three games I’ve bought run on release day), you’re pretty much home free.
For whatever reason, it’s the opposite for me. My games usually either crash quickly or don’t start at all anymore in X11 sessions — even with gamescope.
Whereas Wayland works perfectly for my games — without gamescope.
PS: I use Hyprland and/or Cinnamon (Wayland) to play games with Nvidia graphics.
Maybe KDE/Gnome users with Nvidia would have a problem, in which case, it’s probably an Nvidia problem related to KDE/Gnome. Or maybe it’s just my card — Quadro P3000.
Which is odd, since Proton just started pushing Wayland about the New Year (and disabled by default). I finally remembered to enable Wayland for Proton this morning (after my last reinstall in December?)
I used to not really like Wayland, but for some time now, I’ve been rocking Wayland much more than X11 and I love it a lot. It has been working really well for me.
Xfce user here, I’ll move to Wayland when Xfce is ready for it.
It makes no sense to me either, to be honest. Especially since Wayland usually doesn’t like Nvidia, and Hyprland literally says they don’t fully support Nvidia.
Openbox user here I’ll be on X11 for ever 
I’ve always used Wayland since using Linux via KDE Plasma, didn’t bother using X11 even though I knew about it.
Probably the only reason I would use X11 is if something stops working properly or at all on Wayland and I will switch to X11 to see if it works there (Which I haven’t had to do yet).
I have plenty of games from different time periods that all work fine no issues, drawing Wacom Tablet which also works fine (Although I know X11 has additional options I don’t use on a tablet anyway), and no issues elsewhere that I noticed. I don’t have an Nvidia GPU though so I don’t know if things change much there.
XFCE is delivered slowly but largely without errors in new versions. That’s why I use it apart from the setting options that are sufficient for me.
Is not really the case with other DEs. 
The Wayland mode works for me without problems I did not notice anyway. What keeps me from using it permanently is that I only have 1 workspace and thus my whole workflow is disrupted.
I would miss many little helpers who were written about the year for Xorg.
First of all, wmctrl comes to mind to start my applications on certain work surfaces.
Is there already a replacement that works?