They need to do a good Dark Tower series. Make it a mini-series or a series of films.
The question was what hasn’t been made. Dark Tower was attempted.
Dresden files not popular among these parts or how come nobody’s mentioned it yet?
It has technically already been adapted, but it was a stupid procedural cop show with a twist rather than what it should be. If you want a more formulaic thing, just copy Amazon’s Reacher.
Plus, since it’s an urban fantasy, it should be cheaper to make than most other fantasy/sci-fi shows, I think.
The blue(and green) beetle LIVES!
Blood Meridian
I don’t think this is impossible to adapt. I don’t even think it needs a huge budget. If you could nail the cinematography; be comfortable with long sections w/o dialogue; and resist the urge to re-work the pacing you could have something. Think Barry Lindon(1975) but as an ultra-violent Western.
The Cohen bros. proved that McCarthy can be adapted in this way. Think of the opening scene of “No Country For Old Men”(2007).