I do think there was some low-hanging fruit there that Houston should have been able to pick up. I know of one small mission that's comparable in size to groups that have been admitted, but my understanding is that Houston somehow never followed through, and it left those concerned rather unhappy -- but of course, that's one side of the story.
Another e-mail I got recently, though, suggests there may be other groups more actively in the pipeline but that, like St Mary of the Angels, are in a legal holding pattern. (However, as I've noted here, I'm not sure if Houston and the Archdiocese of Los Angeles are on the same page as to what any next steps might be, since the St Mary's situation seems to be edging toward resolution.) If this is the case for other parishes, I'd be most interested to hear about it.
UPDATE: My correspondent informs me that the group in Dennison, TX entered a few weeks ago, under the name St Michael and All Angels. It's good to hear that there's continued progress.