Older generations don't understand games as a hobby/source of entertainment. Many see them as obnoxious (both visually and audibly) wastes of time.
Most do not, and will not, acknowledge that many games are story driven, to the point where it feels more like you are playing the title character in a movie, rather than just "shootan!". While the Wii has helped bring gaming to the mainstream, said games are not a true sampling of the pinnacle of electronic entertainment. At most they are virtual board games or $40 mini games. These games, however, do not provide much crossover, as families prefer to stick with the "family friendly" games and continue to gloss over those that may be stimulating in other regards. A perfect example can be seen with the sales of the more "adult" Wii based games as opposed to their family-friendly peers.
One day we will have a crossover game or more likely, as we get older and become the dominant demographic, we'll change the outlook on modern entertainment that unfortunately the baby boomer generation currently dictates.