Do all next-gen games HAVE to be 3D?

sudnshok writes: Last week, an article was posted where an EA executive discussed the high cost involved with next-gen game development. While I agree that sports games do benefit from a high-resolution 3D environment, do all games have to be developed that way? Why can't game companies develop 2D games for these systems? I would assume the development cost would be much lower. As a gamer who grew up on the NES, I'd love to see a new 2D side-scrolling installment of Castlevania or Zelda. I'm curious if other gamers would buy 2D games for next-gen systems.