That would really be a post-Genesis-Sega-esque move.
The market will be completely confused and thrown away if Nintendo makes a non-3D 3DS. It would also really reduce 3DS, in the eyes of a spectator, to a pathetic failure considering it had to have its main gimmick removed, which would tear Nintendo's reputation to shreds after the DS and Wii.
Of course, it is possible, but so is Nintendo taking over the world using 3DS's hypnotic rays.
“These are my principles; if you don’t like them, I have others.” – Groucho Marx







