Ron Howard fought like a demon to get either a Dark Tower or a Talisman miniseries off the ground. Like, even way before Game Of Thrones showed what was possible. Either one of those would take Game Of Thrones level money, and Sandman level CG for the worlds. Personally, I'd prefer Talisman. Talisman is basically R rated Legend Of Zelda. Audiences would lap that up better. Then you could use that to lure them over to Dark Tower. "From the makers of Talisman!!".