In order to view any kind of 3D, it's necessary to ensure that your left and right eyes see separate images. It's the difference between those images, the parallax, that creates the 3D illusion in your brain. Red/blue, or anaglyph, does this by color-masking: Draw on a white piece of paper with a red pen, then look at the drawing through a red filter (or just shine a red light on it). Now everything's red and you can't see the drawing. With anaglyph glasses, the red filter voids the red image and darkens the blue, while the blue filter voids the blue image and darkens the red. It's an imperfect system, due both to the color conflict and loss of light transmission, but it's portable and cheap and that's why it's still around.
To see 3D with your Real-D glasses, you need polarized presentation-- the left and right 'eyes', or 'fields', projected through polarized filters that correspond to the ones in your glasses. That means a silver screen and either (A) two synchronized projectors with complimentary polarized filters or (B) one projector alternating left and right images through a synchronized alternating-polarization filter.
It's a lot simpler to play alternating-field video (i.e., left-right-left-right on consecutive frames) on a regular TV, and view it with 'flicker' glasses that black out in time with the presentation so that your left eye only sees the left image, etc.
Obviously, higher frame-rates make this solution more attractive, but it can be done with a standard TV-- and consumer-grade systems do exist for that.
The future option will probably be 'free-viewing' systems. Some sort of lenticular monitor, affording a 'deep' image without glasses. The viewing angles would be limited, and the hardware expensive, but I see that solution taking precedence in sports-bar scenarios.
