The issue with Wayland is that we now need a new re-implementation of tools foreach compositor. Yes, compositor - previously in X11 known as Window Manager. You will end up with tools being scarcely available.
Why aren't we building a compositor with plugable/programmable components? That would make it behave more like Xorg, where there is a primary implementation, so things like screenshots, global hotkeys, and other things work consistently, but we can swap out different window management capabilities.