To chime in to Anonymous (you really should sign up so we have a name to go with the detailed comments), you seem to keep bringing up worldwide sales for these games. I'm sure that when you take in worldwide sales these games are still doing very well, and possibly better than ever. But I think it's safe to say that we here at PixlBit are talking about the sales climate for North America only, since pretty much the entire staff resides there.
And again, I just don't see a lot of JRPGs crossing over beyond the hardcore niche, which is not where the genre was, say, 15 years ago. I can only speak for how these games did for my store in the 8 years I worked retail, but JRPGs (or as we called them back then, RPGs) were hugely popular, with games like Lunar, Arc the Lad Collection, Final Fantasy (take your pick), and Kingdom Hearts selling far and above most every other game at the time. RPGs were constantly on the covers of gaming magazines, and the announcement of a new game in a popular series was always a cause for mass hysteria.
I don't see that as often anymore. Even the release of FF XIII was met with a kind of muted excitement, and that was before the reviews and fan backlash started to pour in. Dragon Quest IX indeed did amazingly well, especially if you compare it to the sales of VII and VIII, which were pretty disappointing. Can DQ X top that? It remains to be seen. I've heard many hardcore DQ fans raging against that game, criticizing everything from the graphics to the fact that it's an MMO. We'll see how it does. I really feel that the "Wii 3" from Operation Rainfall are going to sell as expected, that is, the hardest of the hardcore will buy them and love them, but they won't crack the top ten on the sales charts.
And I would love to be proven wrong about that, but that's how I feel.
Also, I appreciate that you realize that our comments and statements are our opinions and feelings. Feel free to disagree, but there's no reason to either get angry or take it personally. People may not agree with you all of the time, but that doesn't negate their opinions, nor do their opinions negate your own.