A videogame called "Guns of Eschaton" has just been announced and it's protagonist is a gunslinger bound to reincarnate over and over again while chasing a world ending evil - sound familiar?
From the PlayStation store page for the game:
"The Black Rider rode to the end of the world, and the gunslinger followed.
This is a personal journey through a world-scale catastrophe. You are a man who has lost almost everything, trying to return home before the last scraps are taken from him. The road ahead runs across the Old South of America now transformed into a haunted frontier of ruined settlements, mythic roads, impossible machines, monstrous factions, and historical figures caught between legend and damnation. This is not only the end of America. It is the beginning of something far worse."
Looking at the game it's definitely it's own thing, but I'll be dawned if it isn't making me think that some kind of Dark Tower RPG would have the potential to be a fantastic videogame.