I don't think so -- I saw it only because I was curious how the 3D effects were. I would not have seen it if it were only available in 2D. Same goes for the people I was with and many I've talked to.

You can't show the 3D in marketing, but you can (and they did) highlight the concept of it. It's like all those ads on TV about fancy TV screens with superior image quality -- they obviously don't show you the screen itself.