Someone else quoted here that Wayland needs toolkit support for lots of things (moving, resizing, decorating). Are we going to see that support (possibly contributed in parts by Canonical) in gtk (and QT/KDE, fwiw)? Or is this basically going for Unity only?
In other words:
I appreciate a more modern, desktop oriented architecture. X11 seems just too much "Mainframe terminal" focused. Which is nice - but not on my laptop/netbook or in the majority of private use cases, really.
I fear, though, that this leads to a two classes of desktops for a while: The shiny Wayland one and the poor thing that still needs X11. Note that "fear" implies more emotions than reasoning - I don't know enough about Wayland support in other toolkits yet and don't understand how it could/would work with "arbitrary" setups (Open-/Fluxbox, lxde, one of the tiling wms).
Update: I was reading up on Wayland - and completely missed the blog entry from Mark. The statement "We’ll help GNOME and KDE with the transition, there’s no reason for them not to be there on day one either." removes most of my fears.