There have been a lot of RPGs on both Wii and DS but how many of them have been really good? There are quite a few, yes. I bet both you and I would agree that many games, like the Mario and Luigi games, Radiant Historia, The World Ends With You and Dragon Quest are among those. There are probably a lot that I am not familiar with, but its hard to deny that they dont sell nearly as much as they deserve to sell. JRPGs appeal to a niche audience and thats why they have a harder time coming over. The fact that we are getting more only means that that niche is expanding, or people are more willing to buy these games now.
That said, I still believe that among the flood of FPS games and Western RPG's even, JRPG's have had a hard time finding their footing among those giants. Not saying that every FPS or Western RPG is good, but they will more likely appeal to the US audience than a JRPG, I believe.
In the end of the day, I dont think anyone here is against JRPGs and I think that speaking generally is the best way to approach the situation. Speaking only to a niche audience is alienating a massive group of people. So when you look at the grand scheme of things, JRPG's have suffered over here. That said they have had a resurgence in terms of quantity and quality recently. Thats great, and I hope to see more of that.