By the time the GBE is released the, DS will have at least 3 years to its lifetime, and will have a totally new identity for itself... right now its N64 games with Wireless and Touchscreen and the two screens... by the GBEs release the games will be radically diffferent, developers will be fully using two screens as its standard.
The GBE is coming, its cracy to believe that Nintendo will continue to sell the GBSP. It all depends on how good the PSP does. If it does badly, the GBE will be released 2007, maybe even 2008. If the PSP does very well, then Nintendo will be pressed to release it sooner. Either way, the GBASP's Life Cycle will end sooner rather than later. Heck the GB didnt last that long, we had the GB Pocket, GB Color, GB Pocket Color
The whole point of calling it a Third Pillar is in fact, that its a third pillar. Home Consoles... The Game Boy Line and the DS Line.... Theres a reason why the DS isnt called Game Boy DS
Also dont forget, the DS is made to atract Nintendo fans and Non Gamers... the GB is strictly for the Nintendo Hardcore fans