Jesus Christ. The comments section of that article is frothing with people who are SO PISSED OFF because (apparently?) All-Star Superman doesn't deserve to be made into a film.
Well to be honest, I don't really think it does, either. The story isn't
that impressive and the action is actually fairly low-key. What makes All-Star so special is the near-definitive characterisation and the art and some standalone issues (like #10) that are sublime.
There are Superman stories that would lend themselves to an animated adaptation far better than this one would, even if they aren't as highly regarded.
Last Son by Johns and Donner is one and
Red Son by Millar is another. Oh, and you know...
Birthright.
Gene Wilder would be pretty good as Quintum (he's certainly the most obvious choice), but I wouldn't be adverse to seeing Martin Shortt playing him, or a character voice-actor like Frank Welker.