I think some of the reason that American RPG's are doing a little better is because Japanese and American RPG's are totally different.
Japanese RPG's are console games, with a heavy emphasis on music, story, charcters, and puzzles. I enjoy that suff, but I know it's not everyone's cup of tea, and bad translations and slow game play can hurt them.
American RPG's have their roots in computer games, and are starting to get ported over to the console market. Morrowind started as a PC game, KOTOR got a better version for the PC, and I'll be shocked if Fable does'nt make it to the PC at some point. Very few console RPG's get ported to the PC (FF7 and 8 being the only ones I can think of right now).
(On a related note, was'nt Working Designs going to port Lunar Silver Star Complete to the PC? How did that work and what happened there?)
Anyway, American RPG's are more battle centric, with a lot of 'hack and slash' gameplay and faster battles, heavy use of graphics, and playing with more then one person. Designed by Americans, they will do better in the United States. That's true with any genre.
I'd be happy to see both types of RPG's continue to grow, but I've always prefered the Japanese RPG's myself. With some excpetions -- Morrowind owned me for six months.

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