The DS passed the PS2, and I don't think there's such a difference between consoles and handhelds that they shouldn't be influenced by each other.
Sorry I'm a couple days late, I have precious little free time and as fun as this is I can't devote much to it. Anyways, I went looking for official info that the DS passed the PS2 and found none, the PS2 was 1 million ahead and still selling 3 years ago and both no longer sell. I looked up "DS outsells PS2" and found the source, VGChartzzzzzzz requoted by multiple Nintendo fanboy sites and blogs.
Well, I would hope NWR was above that but either way, for the sake of argument it doesn't matter. What matters is Sony took cues for their console from the most popular console of all time, and Nintendo from the most popular handheld of all time. We're seeing how that worked out for both.
Such a juicy thread, I really wish I had the time to go bull in a china shop in here.