I went to an Alamo in Houston and while I liked the concept, the theater was a bit dank (which I worry is an inevitable result of serving beer and food) and not a place I'd prefer taking my kids --- which is relevant because "family of four" seems to be the core market for blockbuster films.
I like Alamo, don't get me wrong, but there are downsides to the model.
The Alamo Drafthouse in Houston was a franchise location and not run by the same owners. In the past year or two, however, the parent company purchased the franchise locations outright and shut down the franchisee concept.
I doubt it's inevitable. The Movie Tavern is a chain with a similar concept. Food, beer, etc. served with the movie. They've got a location here in Denver that I rather like. Not sure exactly how long it's been around but I've been going there several years and they've managed to keep it pretty clean and nice. I like taking my kids to movies there. They get shakes, I get beer. We all have a good time.
We saw "Ratatouille" there, at around 5 in the afternoon. It was a spur-of-the-moment thing. Maybe it's 18+ after 7:00PM? Maybe it used to be? I don't know.
But at any rate, you're making my point for me. :)
I like Alamo, don't get me wrong, but there are downsides to the model.