It's far too early to encourage toolkits and WMs to target Wayland directly for anything that can already be supported on top of X
Around 60% of the core GNOME modules already work under Wayland. The plan is a beta in GNOME 3.10, full support in GNOME 3.12. If a GTK 3.x+ application doesn't make specific X calls, it'll work under Wayland (devil is in the details :P). Firefox also finally seems to be going to GTK 3.x, though as they're huge, they might have various dependencies still assuming X.
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