My thoughts are that the 360 presents a tremendous opportunity for japanese developers to fill the role of the DOA series. With very little competition in the genre, it's much easier to stand out form the crowd and become the next big thing.
It's shown that western games really like JRPG's like FF, DQ and Kingdom Hearts, perhaps the japanese developers are striving to be the new FF or DQ on 360 and capture that huge untapped market.
My hope is that these JRPG's sell really well, dispelling the myth that xbox gamers don't like JRPG's. After all, the fastest selling 360 title right now is in fact not an FPS or racing game but an RPG.