I doubt that Akira will turn out so hot, even with the director of Unknown at the helm.
Dragonball Evolution was awful.
Cowboy Bebop, Voltron, Neon Genesis Evangelion, Battle Angel, and Full Metal Panic are all stuck in development hell.
The main problem is that Hollywood tends to take the trappings of the original IP, and then throw the essence out with the bathwater (you know, like what 2K Games is doing with X-COM). The fans are going to see it regardless of how much they grouse, so why not try to trick as many non-fans into showing up as possible?
If you don’t think a property is going to make money without completely destroying it and rebuilding it in a generic fashion, why not just make some other generic movie/game/whatever?
Why trick the fans and then sock them right in the balls?