But King pulled off an admirable open ending in
The Mist, did he not? Like anything, I think it's comes down to how it's handled.
Cell had a very dodgy premise and far too big a theme for its slender pages, and it also suffered because King has done that end-of-the-world thing so much better elsewhere (e.g.
The Stand). I mean,
Cell was even worse than
Dreamcatcher and I really didn't think that was humanly possible.
I wouldn't base any of your writing ideas on
Cell, if you want my honest advice. Seek out stories where open endings have happened and happened well?
JB