^It would make sense for them to scrap that plan since the sprung tents would not have been utilized. I would think they (again) wouldn't go with it if they couldn't include using them.
Then again, they could just move whatever they have stored in the Carnage Warehouse to them.
They scrapped it because of needed coverage by Operations. The house locations were accounted for.
The Sprungs, aside from their location, aren't phenomenal. They're temporary structures that just haven't moved in over a decade. The flooring is plywood platforms on dirt and they have rats. The construction in KidZone will impact that location. Either the power running to it will get cut, or that plot will have a crane put on it, or it'll become part of SMW.
Simply put, if they determine a merged park event is necessary because of construction in the back half of Studios, they have options. They can build more houses in soundstages or, if they need a sprung, they can just move it.
EDIT - Here's a quick mock up of the merged park layout.
Blue - Guest paths
Pink - Potential house locations (every one has been used or considered in the past like 33)
Green - Scarezones. I forgot the front crossover, which could go behind CitH, between the soundstages, or through the soundstage even.
Purple - Potential queue, plus the lawn in front of the stage if it's not used for
Yellow - Potential show locations
But as you can see, there's plenty of potential to do it this way again. It's not ideal but totally feasible.