We all suspected that the Game Boy Advance was basically moribund, because it lacks the high-tech money-printing capabilities of the DS. Confirming our suspicions, Shigeru Miyamoto mentioned in an interview with Kotaku that Nintendo basically didn't care about the platform anymore.
Now, according to George Harrison, it's not just Nintendo's "third pillar" strategy that's out, but the whole Game Boy line. He told GameDaily that "This year in our marketing you really won't see much push against Game Boy itself, so it will kind of seek its own level. It's hard to say in the future if we will ever bring back the Game Boy trademark."
It makes sense for Nintendo not to bring back the Game Boy name when the DS has so much momentum. But, personally, we think it's quite sad to see a Nintendo standard go away. Oh, well, at least we've got the Wii now to take over as the most awkwardly-named Nintendo console on the market.