Funny, I went to Catharsis and found it such a pile of dog squeeze I actually softened my criticism of this year's HHN a bit. Even at it's worst I find HHN miles ahead of that in terms of design, effects and scares. Ditto that raved about haunt in Winter Haven I went to 3 years ago.
I do think HHN Creative seems to max out at about 4 or 5 houses. Usually easy to pick them out (this year, every soundstage but TWD, Krampus, Tomb). You can tell a lot of work and thought went into them, even if an individual house doesn't work for you, like AHS for me this year. The rest are pretty much thrown together rehashes of existing elements, tho a strong cast like in Havoc 1 or Halloween 2 can still make one a crowd-pleaser.
The problem is as crowds increase, the natural inclination seems to be up the number of houses with long queues to keep people off the streets. I know the fanbois would love a 12-house event across two parks, but I fear we'd get 4 good houses, 8 mediocre at best. You can already see it in the scare-zones; all the effort went into Vamp and Dead Man's Wharf, leaving 3 or 4 cheerleaders and geishas to walk around a completely undecorated street. (The roaming hordes that don't roam and aren't very populous.)
Ultimately it means Universal needs to find a better way to handle crowds, the #1 complaint about the event for decades. Need to jack up the criminally low prices of their multi-day tickets, maybe phase those out all together. Raise the 1-day price, too, and cap attendance like MNSSHP. More outside shows, too. I think they've stretched content as far as they can. But ultimately I'd rather pay more for 6 good houses that I can actually see in a night than the cluster the event has been allowed to devolve into.