Nintendo initially said that the DS was not a Gameboy, but a third tier. Since the DS is a huge success, Nintendo is no longer producing the Gameboy Advance SP or Micro, and desires to focus its attention on the success of the DS.
I thought I would go ahead and post my prediction for the next handheld. For fun, we'll call it the DS Advance (see what I did there?) - yes I think they'll stick with the dual screen system. Here's a rundown of what I'm thinking:
*Backwards compatible with DS cartridges
*New media will be on mini discs like the Gamecube
*Graphics will better than Gamecube games - at least Gamecube quality
*No GBA slot
*System will have applications - internet browser, pictochat v2, a day planner/calendar possibly?
*Friend codes will still be in place for games (and pictochat v2)
*No hard drive (except small space for internet cache) - games will still be the primary focus, not mp3s or videos - and this keeps the cost down
And a couple of my own personal wishes...
*Comes with DS1 storage cart
*Better Wii connectivity - download Virtual Console games to your DS that can be stored on a DS1 cartridge
*Download Gameboy, Gameboy Color, and Gameboy Advance games to your DS1 cartridge - Also, upload-ability to Wii (I would actually prefer the WiiVC get GB, GBC, & GBA games...)
*DS Network - see your friends online - send single card multiplay data to friends via the internet, not just locally. Any game that is multiplayer should be playable from any distance.
I don't think this is too unrealistic of an idea, and I think I would be pretty easily persuaded to make the purchase. I can't imagine Nintendo making another handheld system that didn't take advantage of the DS's success and large game list.
Time will tell!
(PS - on a side topic, I am now cruising into 40 hours on FFTA2. I really expected to be finished with it already, but I'm definitely not complaining...)