Very interesting: the proliferation of 3D tech in TVs and theaters may threaten the current model of brand placements because of how 3D puts background is out of focus:
"One of the key characteristics of 3D, as used in Avatar, is "limited depth of field." Essentially, this means that the figure onscreen in 3D pops out at the audience while the background appears out of focus. An attempt to focus on the background causes what some call "Avatar h3dache."
For product placements though, the loss of a clear background means the elimination of countless placement opportunities for a wide range of brands. Cars logos, soda names, box graphics and any number of other brand identifiers will appear to be just a swirl of blurry color. Any attempt to distinguish them will be pointless. What good is a product placement that cannot be seen?"