No, we don't need more westernisation of the JRPG. What we need is more quality JRPGs, Square seem to be under the impression that if they keep westerning their games they'll sell better, but that's the thing, they're two different genres and while there is a cross over, to some degree they have different audiences. I don't expect my western RPGs to be more like JRPGs, even though I "prefer" JRPGs, because they're different genres.
JRPGs are generally characterized by turn based combat, more stat sheets and a linear narrative based around experiencing a rigid narrative. They're more about the gameplay being light enough to serve the story that someone wanted to tell in a constructed manner. Until you reach the end game, there's unlikely to be many points where you can just bugger off and do what you want. JRPGs tend to be very cleverly disguised corridors, with the occasional forks that have stuff in then, but eventually you'll have to return to the path and carry on. (Well except for FF13, that didn't have a pretense of being anything else than a very long, very pretty, very boring corridor, with any attempts to veer off the beaten path guarded by mechanized tigers.)
WRPGs while having a narrative, and in the case of the greats, (Baldurs Gate, Fallout 1/2, Planescape Torment, etc etc) have a fantastic story, but are more about the player character being a conduit to /explore/ a more loose setting and world. Generally you don't /have/ to follow the story, side-quests are abundant and you're quite free to wonder the world seeing whats up and leave the main story for ages, they're far more sandbox in nature and always have been.
In terms of themes, that's why some people like JRPGs, and they can be serious (or at least not whimsical), as is the case with FF6-8, or serious and light hearted at the same time (FF9, the Persona games). Yet they tend to have more diverse worlds, with all kinds of crazy shit going on as a result of not having ASOIAF or Tolkein as their main influences. I mean lets be honest here, most WRPGs using the fantasy setting are all pretty similar to each other on the surface.
Yeah I'm not really sure where I'm going with this, someone take this and make a more succinct point out of it ><
In summary, JRPGs aint for everyone, just like every other genre, their culture is different to our, and appeals to different people, it doesn't need westernisation.