I've heard some people saying they are thinking it won't happen elsewhere because of the 360s popularity outside of Japan. As it currently stands, the artwork used on a 360 case can be easily adapted to PS3 cases, and vice versa. If they switch to this template, the cover art on PS3 cases will have to be wider than on 360 cases.
Still, the cover art for EyePet used this template, so it could change. This sorta thing always weirds me out though. Last thing I want is for my PS3 collection to be as non-uniform as my Genesis collection.