I am worried that the manpower will be divided and that minor decisions now will fuck up cross communal efforts. That's a reasonable belief.
What the manufacturers decide to do is critical, and I promise you they aren't taking some kind of meritocratic open-source approach to evaluating where to place their resources.
Wayland is already at 1.0, and has support from Valve, Nvidia, and AMD behind it. I don't see it disappearing soon. Especially since the implementation of Mir isn't even usable yet (while Wayland is).
If so, that's a pretty interesting development.
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EDIT: Thanks for the update ElliotH!
Nvidia http://www.phoronix.com/scan.php?page=news_item&px=MTE5M...
AMD http://www.phoronix.com/scan.php?page=news_item&px=MTE2N...
A great pity.
[1] https://plus.google.com/100409717163242445476/posts/jDq6BAgd...