Plus, you can always turn it off if it doesnt do it for you.
That's the point though -- how many people will be turning it off? If it's a large # of people then the 3D aspect is essentially a gimmick. What is the bigger draw to 3DS, the system's horsepower or 3D?
Depending on how badly it affects my eyes (because 3D for me usually equates to nausea), that's still something to be seen... I can't help but think it will certainly be a cool feature, though.
But beyond that, I'm mostly looking forward to the horsepower itself. I love my DS, but a DS that can pretty much match the graphical capability of a GameCube (from what I can tell) - that is pretty much the deal breaker in this case.