#4 Possesses other Superstars
Perhaps the dolls and puppets in the Firefly Fun House have a greater meaning in the bigger scheme of things. Could they may be used to depict Superstars that Bray Wyatt wants to possess and get into the minds of?
This is something WWE haven't done in recent years, where a dark gimmick possesses other Superstars, tapping into the supernatural side of things.
Perhaps Wyatt could possess other Superstars and make them do his bidding.
While it is far-fetched and could fail miserably, WWE could give this gimmick a try. WWE haven't used a supernatural-themed gimmick in a long time, but they do have a show on their YouTube channel hosted by Baron Corbin called "Baron Corbin's Haunted World".
Maybe we could even see Baron Corbin feud with Wyatt, where Corbin is a "remover of demons" (you do have to thank me for this name, WWE).