Honestly... I think Action Theater's original placement was okay but very missable. When WindSeeker replaced its entry plaza, that building became barely usable, even with lots of signage pointing to Urgent Scare during Haunt. It's like they went out of their way to make it as inaccessible as possible when they decided to put WindSeeker there. I don't know what they could put back there that would fix the flow issues.

In my wildest pipe dreams, that building would go away, and that space would be used for a show building for a terrain launched coaster (a la Verbolten) located in Vortex's spot. It would wrap its way around Red Racer's turnaround. All building faces visible from Beast would be painted Go-Away Green. I don't know offhand what the theme would be--maybe something mining-related, if the entrance was in Rivertown.

I agree with @TombRaiderFTW that it's placement is less than ideal. Sometimes I often forget the building still exists (which I'm sure the park is hoping for)

Even still, its a more subtle Haunt attraction as opposed to the other giant building in Rivertown

Well the crypt building is too big for a haunt. They could make that smaller and still be able to have a great haunt there. As for Urgent Scare, does that get a line during haunt season?