This might sound like a big deal but it shouldn't be a headliner. Whatever the details (and we don't have many) companies use and drop technologies on a fairly regular basis. Sometimes it's a good fit and sometimes it's not. Obviously in this case Couch didn't do everything Canonical needed (I think someone else actually pointed out that Canonical mentioned that their needs were unique).
For every Canonical that drops Couch there will be 10s of other companies that adopt it because it's a good fit there. All this should reinforce is that every tool has a good fit and that smart implementors pick the one that jives best or moves to a better one when the opportunity presents itself.