For a Terror Tram, you could easily throw Saw victims in there. Some traps on the head, people cutting themselves on a table -- easy. Random Jigsaw soundbytes. Wouldn't even need a full set to walk through. Not saying I think it will happen, but we have seen last second scrambles for much bigger things happen.
Also, I think I understand everyone's lament about this year's properties if we're going by last year's quality as any bearing of projection as to how this year will fare in terms of quality. It's totally understanable to be weary. I have hopes FNAF can be fun and F13 can bring back that old school feel, but in a weird way, it's totally relying on them. Fallout might be cool to look at, at the least, but I have no real desire to hang out in that world. As it is, I plan to visit Vegas, so Scarecrow (depending how much of that is the same there) is of no appeal to me. Poltergeist was okay the first time, so if it's the same repeat, meh. I hate Terrifier. WWE is silly AF, and I am a huge WWE fan, but just no. Blumtram was the only highlight for me last year, but the fact that the tram was a saving grace at all, is doubtful it can bring that energy two years in a row. Monstrous more or less kinda just felt the same last year, so it almost feels stale at this point in the way the UCM mazes started to get stale - my hope is they don't cover any familiar territory so that it fully entirely new. If someone straight up said, "I'm not interested and I'm not going," I totally would believe them at this point -- now IIIII would never personally say that as I'm always willing to give it a shot, but as it looks, I might be going only one time again this year like I did last year. Even if it is a fun time, simply because the properties have no real pull for me. I've gone at LEAST twice every year since 2011 up until last year -- HHN feels like it's trending downwards if I can just shove it away in the "once is enough" bin. Again, that's just me personally, but I can help verify that feeling others are commenting that it's not just all negativity, doom & gloom -- maybe the event will always have fans, but it's not crazy to say some of it's old school fans may possibly start dropping off the wagon.