Well, Sony definitely killed Sega and wounded Nintendo, but I think it was a thing of good timing. Like I said, their system came out earlier. It was easier to write games for than N64. It used CDs (even though I like cartridges). All of these factors led first to Square making FF7 for PS, which I see as the entire turning point for the company. I think if Nintendo had come out at the same time with a CD based system, Sony definitely wouldn't have smashed them as much.
But I do agree that they have the backing that will most likely force the sucess of the product.
Regardless, I still want to get a GBA SP, if for nothing other than Mario Kart and Link to the Past. Playing those games on the go would be a dream come true for me
ps-I just noticed that Nintendo's site claims that GTA3 is in the works for the GBA. that should be...interesting. I guess the contract is nearing its end.