I think to a large degree, WRPGs are supplanting JRPGs. But that makes sense, I'll use my gaming tastes as an example:
I have always liked games where my choices/actions matter.
For PC gamers, if you can recall, think back to Wing Commander 1. Way back in 1991 the outcome of the game was basically up to the player. Not to much their choices, but their skill. If you failed a bunch of missions, the Terran Confederation would lose systems and you'd get pushed all the way back into human space. Do well on missions and you'd forge ahead into Kilrathi space - with more than one available ending. Games like this make the user feel like their contributions matter. You don't just repeat the same areas until you "get it right."
Flash forward to now, western gamers generally don't like RPG that are effectively just "role WATCHING games." Queue up a set of skills, finish a fight, and watch more cutscenes. Take a game like Mass Effect though, and even though it's a shooter, you very much feel involved in the story. And even though the outcome is pretty much determined, it's totally up to you how you get there. You don't feel like your choices are arbitrary.
And I see people that complain that in shooter/RPGs that player skills matter more than character skills. Isn't that always the case? Unless you can select any set of skills and win, knowing what skills to use/level up, what gear to equip etc, IS a player skill, just a different one than aiming and shooting. If a game requires no player skill, then it's just a movie with lots of pauses.