I am going to wait and see if they add more restaurants to the list. It's quite possible that they're still figuring out which restaurants to include (maybe the list I found is a work in progress??); perhaps they might alternate restaurants periodically depending on demand. Of course, they have the disclaimer that the list is subject to change, so we could all plan the meals we want, then they could change it the day we're there.
I still have plenty to choose from - so at least for us, the dining plan will be worth it.