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?
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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.