Mothballing the houses for a year is probably not the headache or as costly as one might think it would be. Think of it this way. It costs money to build the houses, conversely it costs money to -strike- them, too. It's been discussed that it was probably more cost effective to just pay the rent for an extra year than to pay the money to strike the houses they just built, and then pay more money to rebuild them. Add in the pandemic which may delay some procedures and it's easy to see how mothballing the houses is less of a hassle.
Not only that, it allows A&D to focus on the Shrek house replacement, and everything that wasn't designed or built yet.
As for WW, it certainly looks inspired from FnAF, but I wouldn't say it's a -complete- rip off since nothing from FnAF has your main character going on a violent rampage against the animatronics, let alone fighting them. Also....
The FnAF film is being done by Blumhouse, so that connection makes it more possible to eventually end up as a house whenever it comes out. (An why WW or an original take probably isn't happening.) Also, production is supposed to start this Spring. We all know HHN goes after "Strike While the Iron is Hot" properties whenever possible, "US" was one of them as they were willing to knock out Tooth Fairy to put it in, or add it as a 11th house beforehand. An Billie Eilish was an example of having to drop something with the window being gone. Considering the IP and who's making it, I wouldn't count' FnAF out from 2022 spec or beyond. Naturally that's not till next year, so 'nuff said about that.