People forget that this is when the DS ascended to insane Heavenly Figures, which closed on 150 million. You'll never see those numbers for any console again without some industry earthquake of change, and 3DS is most likely going to sell around GBA lifetime numbers all said and done (maybe a bit beyond depending on revisions and the length they want to leave it on market).
Good news for Nintendo sticking around as a hardware manufacturer, bad news for that market clearly having shrunk by at least half when you consider the total disappearance of PSP sales on top. Now the struggle to ensure it doesnt erode even further next-gen and Nintendo gives people enough reasons to want dedicated handhelds.