I'm a huge fan of theme park stage shows...BUT, I think three large stage shows (Dragons,Potter, & Monsters) would be a risky business strategy. I doubt that all three would play to sustaining crowds. So It's probably best that one goes away, and gets replaced by some type of ride. Otherwise, one of the three would probably end up being cut after a year or two. And we all know how the theme parks have become reluctant to pay for actors anyway.
HTTYD seems to be a success already. Potter is always A rated.
Monsters is the weak link here and even if it was a great show, it's inevitably going to be compared to Beetlejuice.
The rumour suggests it's going to be family friendly.