VMK will place whatever helps out the game and its members from the Disney theme parks into the game. The Dine-In simply is a great way to showcase Disney films, but unfortunately has become the most popular place on VMK for 'taken and bay be' games. VMK does not just put new public rooms, but puts consideration and detail from them, they learn from each new experience.
I think Splash Mountain room wound up being neither a hit or a loser, as a SM game could have gone either way also.
Tomorrowland will most likely not only be the finest land because of size, but because VMK will know what players like and dislike.
Thanks