While I agree with several who have made the point that the bandwidth required for 3D is nowhere near double that required for 2D (because the left and right-eye pictures are so similar), still, we are looking at an increased bandwidth requirement for 3D. I think this helps explain DirecTV's enthusiasm for 3D. If cable or telephone want to increase the bandwidth they can deliver to TV sets in homes, they have to string more fiber to millions of homes. In my area, while both telephone and cable use fiber in their networks, neither has fiber all the way into individual homes. Stringing new fiber to millions of homes would be a considerable capital investment.
What does this have to do with DirecTV and 3D? DirecTV has the means in place already to deliver lots of bandwidth to subscribers' satellite receivers -- the ku band and two ka bands. Last year, they received permission from the FCC to use their latest satellite, which just went up, to test yet another band of frequencies (which might or might not be used for consumer TV -- I don't know). I think DirecTV is betting on a high bandwidth future for consumer TV.