I mean, you have the environments. You have the mall, the hospital, the funhouse/carnival, and the Russian Base. The lab is basically abandoned. I can see them using the first three environments in the house this year, but if they just did season 3 next year, there aren't really enough interesting characters to justify a full-house. The hospital has enough to work with as you have the possessed news writers and the mind frayer, but other than that, it would just be Billy and the Russians. You can only have so many of those scareactors before it doesn't become interesting.