Everyone agrees that Wayland is better than X11 for your usual desktop. Why is X then used by every major distro? Is it bugs, little compatibility from apps (is that even an issue?) or something else?
What is keeping Wayland from overthrowing X in Linux?
linux;x11;desktop;freedesktop;wayland
I think you've jumped the gun a bit  while many people may agree Wayland has a better design for the modern era (though some still disagree even on that), the implementation is not yet finished, and it doesn't yet do everything needed to overtake X, nor are the applications and toolkits ready for it.   This fall Wayland is expected to declare its API stable so that the toolkits can start porting without having to worry about incompatible changes breaking their port, while the Wayland developers continue working on the bits still needed to flesh out the desktop.The lead developer of Wayland gave a talk and demo at the X.Org Developer's Conference in September 2012 covering the current state and work in progress still - you can either read the summary or watch the video recording.