The Death of 3D Replies

I recently predicted that contrary to contemporary hype 3D will not be the default mainstream movie experience in two years time. In fact I maintain that by then 3D will have reverted to its right and proper status as a sideshow gimmick. But with Werner Herzog producing a 3D movie, The Cave, and the reversioned 3D Titanic looming on our cultural horizon, you have kindly let me know your views on the matter.