Take the 3D away and it could have launched at the cheaper price and not have stumbled out of the blocks. Would say sales would be slightly higher, maybe 5mil. 3D was also however a waste of money on Nintendo's part, the cost of R&D could have been much better spent.
It could have launched at a cheaper price anyways. Iwata said that they overpriced the 3DS because of the reactions at E3.
OT. I personally like the 3D. While the 3D wasn't the selling point and I thought the feature was stupid at first, once I saw games that really took advantage of it, I actively look for other games that I can get that use the feature well.