3D is not an underdeveloped and new technology. Alfed Hitchcock did it decades ago. Disney 3D though seems to be getting it right this time around though, in my not so professional opinion. Going 3D is not expensive in the consumer aspect. For a professional, think again. Laptops can't work on 3D movies, and most workstations don't work that well from my experience with it.
I realize that but you can just buy Nvidia's special graphics cards (which aren't too pricey) and get the TV with 3D glasses bundle which will cost <$1000.
will soon become a problem because of camera's like the Red One. From what I've seen its near impossible to do 1:1 editing with it unless you throw all your money into your machine. And then you need a 4k monitor to check focus etc... $$$
I didn't intend to claim that going 4K was expensive, just that it may not become the standard.