Yeah, if I was pitching this show, and they were only interested in it if there could be additional seasons, I'd tell them that subsequent seasons would each have a different premise, much like American Horror Story.

Maybe season 2 is a Star Trek style sci fi show, which slowly turns into lovecraftian horror, with madness causing weird 4th wall bending.

Season 3 might have high school kids become power ranger knock offs, only to have things escalate until we're in a dark story about the horrors of war.

Season 4 is a documentary about the making of season 4, with every episode advancing a meta-narrative that slowly shifts from behind the scenes promo, to reality show, to true crime, to unsolved mysteries, to ancient aliens, to breaking news coverage, and finally a historical documentary.

Season 5 is the story of Old Man Henderson, with perspective switching between the game and the players, and with strange things happening whenever anyone reads from the backstory of doom.