Why 3D?

Apparently, everyone is trying to turn their movie into a 3D movie. There's "How to Train Your Dragon", "The Last Airbender", "Toy Story 3", and a few others I can't think of right now. My question is...what's with all the 3D. Is that what we're coming into now? Soon, all movies will always be in awesome 3D? Seems like it was just 10 years ago when I didn't hear so many trailers saying to go watch this or that movie IN 3D. Now I know directors try to have their movie in that way to make it have that extra awesomeness and to bring in more people and let's not forget the main reason...because the other directors are doing it, but you don't need to have 3D to have an awesome movie. I think someone needs to let them in on this information. Now if you happen to love every movie in 3D, then you can just ignore this post.