Don't give them any ideas. The preshow needs to work as intended. The entire attraction does. Even with the large amount of AAs, because of the way they're staggered between scenes, it's still painfully obvious when even just one of them isn't working.Aside from setting up the point of the ride which is a lot more important here where they're introducing a new character and explaining why all these monsters are in the same place, it's also used for staggering the locker access and dealing with crowding in that area.
They could manage that crowd issue with an employee controlling the flow of people but I'd imagine they'll be a lot more motivated to keep the specific pacing provided here intact be it with efforts for more reliable uptime or a good B-mode that could end up some day being the new A-mode (ala Everest Yeti encounter).