Fighters and racing games are no longer staples of the Japanese gaming diet. And while I agree wht Wiimote fails to execute satisfactory controls in a number of proven/popular genres (which is partially reflected in the sales of the more competitive western makrets) at the end of the day the Wiimote seems to tap into the gaming genres that Japanese gamers are craving.
Look at the top sellering Wii titles in the Japanese market from the above list: Mario Pary 8, Big Brain Academy, Wii Fit, Wii Sports, Super Mario Galaxy, and Mario & Sonic at Bejing Olympics. I don't see any Fighters, Racers, FPS, or Sports (traditional) games breaking the top 20 last month on a home console.
That's because the traditional market don't keep games anymore, heck some of them don't even keep consoles. They buy used games and trade. That way they saved money and allowed them to play more games. That's why RPGs rarely big seller anymore. Games with replayability will generally have better chance or games that target different market that don't trade on the second hand market.
I wouldn't be suprised if the second hand market make as much money as the new ones from the traditional gamers. Most publishers know about these problem. Heck they even tried to get second hand market outlawed. I guess only Nintendo see that the traditional target market aren't worth their time anymore and expanded the market beyond them. Only time will tell if other publishers will follow.