Personnally, I think most of you underestimate the hacker mentality. Many feel angry about Mir, which is the latest thing, because Mir is solving the same problem as Wayland. Don't believe me? Read:
http://www.catb.org/esr/faqs/hacker-howto.html#believe2. What's worse, Ubuntu already has a reputation for not contributing back upstream, and now they circumvent outright what was perceived as upstream in Wayland.
The attitude of Canonical is therefore seen as a lack of interest towards the larger Linux community. There is, I believe, a view by which Canonical is building it's success on the Linux community's effort like a parasite. I don't agree, but that is what I perceive. It seems there are some unwritten rules where the software is free/libre but just as long as the social construct's boat isn't rocked too much...
That being said, Wayland isn't doing it for me. That's because Wayland isn't on my system, in fact Wayland isn't really anywhere to be found except for a few rare exceptions. So, since Mir is opensource, and Wayland is useless right now, I'm rather glad for the competition. Let the better project win!