Well, what about running the regular apps installed on the computer I'm remotely connected to ? What if I want to run just any application remotely from my server to my netbook, will I need to keep two different versions of my programs just to be able to run them remotely ? I hope not.

What needs to be provided is, given computer A & computer B both installed with a plain Ubuntu distribution (desktop and/or server), I can do "ssh -X" (or "ssh --Wayland", I don't really care), and get any app running on A being displayed on B. If GTK/Qt makes it transparently using X instead of Wayland direct rendering, fine for me. If I need to install special packages (e.g. "firefox-x11") and run special versions of apps, then it'll be a serious regression, and I'd be looking seriously at alternatives (probably a X11-buntu sub-distribution ;) ).

I guess this is the case for many people: as soon as you have a setup of several computers at home and organised them into a local network (and not just a bunch of individual machines that connect to the Internet independently), you start to rely on network management (not even speaking about enterprise setups). I use daily "ssh -X" to run remote GUI apps on my netbook.

I also happen to maintain my parents' computers (located 25 km away), and once in a while I pop up one of their applications on my screen, to reconfigure it when something's broken or not working as wished, at least when there are no good CLI way of doing it, which is the case with most GUI apps today (it's quite slow over the internet with different providers, but it just works, which is enough for my needs).

Being a long-time Ubuntu user, I'd hate it to have to switch away from it (it takes time to reinstall all those machines - and I can't upgrade them remotely as I'm doing today with Ubuntu), but remotely running GUI apps is a must.

If in two years (or whenever the switch is done), I can log in to any computer running Ubuntu 12.04 or whatever and run any regular app forwarded to my own netbook/laptop transparently, then no problem... otherwise...

I'm OK with Ubuntu switching away from X and all, but I'm wary of the apparent lack of concern for network transparency support for regular apps. But they still have time to understand that their user base does not only consist of single computers connected individually to the internet.