Here are Bruce Timm's and Alex Ross' comments on the subject of a Kingdom Come animated movie.
At the Batman: Year One panel at the San Diego Comic-Con in 2011, when asked if Kingdom Come is possibly going to be made into a movie, Bruce Timm said, "It's just not made for 2D animation. It's just not. I don't think we...It's not a good fit. Yeah. So, impossible dream, yes. I'm sorry."
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According to Alex Ross, Bruce Timm doesn't even like Kingdom Come. Alex Ross said, "For some reason, as we were both approaching Superman at exactly the same time he was just starting on designing the show and I was starting work on Kingdom Come we shared each other's experiences of what things we were doing for design and direction, and he was nothing if not hypercritical
well, to be fair, we were both hypercritical of each other. In what each other was doing towards the same source. And he fell out of love with anything that he had liked before with what I did. In fact, he fell out of love with it to such a point that he hated the very idea of what I was doing."
http://www.ign.com/articles/2003/10/22/an-interview-with-alex-ross?page=2
Rich Johnston: "I asked Bruce Timm at last years Batman: Year One panel whether he might take Kingdom Come on as a project. He told me that it wasnt a story suited for animation. Do you think your style could be adapted to animation?"
Alex Ross: "Ive seen some of the Warner Brothers stuff, some of it is quite good, but they dont have the budget for my style. They cant even bring to life George Perezs art style in traditional animation. When youre talking about my style, youre really talking about 3D graphics. What I try to do is bring this stuff to some kind of physical life that exceeds comic book illustrations. If youre not trying to cast people to match my drawings, youre talking about computer animation on a level we still havent seen done. Things that have tried for realism havent worked out perfectly well yet. The best on-screen example of that would be Final Fantasy (2001). They did it very well, but theres still a certain level of stiffness. Until thats fully conquered, a style like mine just becomes reduced when you turn it into 2D animation. The next question is, 'is the story line so important that we just need to get it told soon.' Ive always hoped that DC would never have to scrape the bottom of the barrel in doing that. Id like to think that Im no easily replaceable and that my style could not so easily be thrown out just to get the production on the schedule. And, as you can imagine, I have absolutely zero input in that process.
Say that you use the technology that they use for video games now. Its not perfect, but if they tried something like that for Kingdom Come, then I might be interested."
Rich Johnston: "Like Arkham City (2011 video game)?"
Alex Ross: "Yeah, thats physically possible to doan animated feature that looks like that. Will it be everything I hope it would be? Not yet, but its heading in that direction."
http://www.bleedingcool.com/2012/07/13/the-new-52-is-a-tough-thing-to-see-alex-ross-talks-tower-chronicles-reboots-and-how-to-animate-kingdom-come/