I'm sure there are "business" explanations, BUT, I have never understood when the MK is jammed to the eyeballs with people, why many of the QS restaurants are "seasonally" closed. It certainly does not add to the magic to have to practically fight for a place to sit down and eat while other restaurants are sitting there closed and empty. It would make sense if there were fewer people in the park, but when it is so crowded the acres of parking lots are full---well, go figure. It certainly makes no sense to me and does not make me a happy consumer.
But then QS is cheaper than the sit down places so maybe its a cunning plan for create chaos at the QSs that are open so you'll be more likely to spend more and hit the sit down places.