I'm going to have to agree here; I think GoT would create a slippery slope.
I'm just significantly less interested in properties that aren't predominantly horror (e.g. Ghostbusters, GoT, and even Stranger Things [although, I think you could argue that StrTh is more heavy on horror than the other two]). Now, clearly, those properties could still succeed as houses. I would just always prefer horror properties over popular properties with elements of horror.