If by FNAF you mean the game franchise Five Nights at Freddy's, that could only have boosted their popularity. You get the fans of that game who would at the very least go there to see the real deal (minus the killing) as an additional untapped set of customers. The core demographic (parents with young children) won't care about that game one way or another, and if they do have a child into that game's fandom it will only make them more willing to cajole their parents into going.
The causes for their demise are completely based on the economics of maintaining actual animatronic characters.
I'm 44 of they match a FNAF horror themed dave and busters I'm gonna be all over that... I'm not really a FNAF .. per se... or player but the movie was okay..I liked the Nicholas Cage one similar to it better...
The causes for their demise are completely based on the economics of maintaining actual animatronic characters.