Probably about the same, but Nintendo would have made more money.
The PS Vita & 2DS ($109) would like to have a word with you.
Plus the 3DS would have never gotten a lot of important key titles from 1st Party to 3rd Parties. And no 3D Video & Photo taking would also affect sales. No world premiere music videos from big time American music artist would have also affected another 1 million or so less sells.
The specs would be far less greater, and further affect the 3DS sells, becuase most Bita owners would have never got a 3DS, without certain titles & specs.
The 3D actually prevented the 3DS from becoming a GameCube/PS Vita situation.