I think we’re arguing two different points.
My point is that the translation into a haunted house is tricky to adapt.
I’ve never said something has to be “horror enough,” or that popularity doesn’t matter. If an IP is popular enough, Universal will absolutely look for ways to adapt it, but it also has to work.
I don’t remember the Terrifier debate ever being about whether it could work as a haunted house. The question was whether Universal would be willing to cross that bridge, given the content, especially since the franchise was still relatively niche at the time of that discussion. I even remember people pointing out that if it becomes successful, maybe the convo changes.
With Backrooms, brightly lit, wide-open spaces aren't exactly what haunted houses are designed around. If Uni builds a Backrooms house, I don't doubt fans will come, but how do you sell the GP on this:
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If you have to ditch the bright, open, liminal spaces in favor of a more traditional haunted house layout, you've removed the thing that makes Backrooms unique.