The past few years NoA's been deluging the DS with RPGs though (Glory of Heracles, Mario & Luigi 3, Fossil Fighters, Fire Emblem, Golden Sun, DQIX/VI, tons of Pokemon titles and spinoffs, etc). It's not like they've shied away from titles like Xenoblade at least, not recently. Wii hasn't had a ton, but then it's not like Nintendo's had a ton of attractive Wii RPGs they've skipped over either.
Looking at raw numbers also doesn't help when a good chunk of those titles are things that wouldn't really make for good localizations anyway (like the NHK Quiz game for example, or that Google Quiz game). I'm not saying Nintendo's localization track record is stellar, but just doing pure game counts doesn't really bring any clarity to things, it more obscures any meaningful context.