VHS vs DVD is not a valid comparison. DVD didn't overtake VHS because of quality. It overtook it because of ease of use. 5.1 is not something that is easier to use for the consumer than pro logic II.
People don't enjoy newer tech. They enjoy tech that makes things easier for the. Both 5.1 and PLII require surround sound speakers to get more sound than just stereo speakers, right? Then the fact is that most people don't have surround sound, so they can't even get the full benefit of either sound format, therefore, PLII is only something that audiophiles hate, not the mainstream.
That's why Nintendo didn't bother to upgrade. Not the legacy, but that they knew most people cared more about the games than how they sound on speakers they don't buy.
Nintendo will likely upgrade to something higher, but only because it would cost little to do so, not because the old format has lower quality.
I know audio is your specialty. I like to draw pictures, so I know picture quality. But I know damn well people aren't clamoring for HD video. That's not their interest.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs
