Well, it IS possible to make live-action anime from Hollywood, but the point is, most anime are far too "out there." The Japanese are pretty much used to these eccentric anime with their ludicrous concepts, and HAMMY characters. If they focus more on stuff like Lupin III (which, personally, I think would make a decent comedy heist film type thing), which are mostly grounded on reality, they'd have greater success.
Considering the fact that, in US domestic box office, Adam Sandler's Grown Ups 2 beat Pacific Rim, I feel that doing something like One Piece, Naruto, and Bleach, isn't something the US is ready for.....