Interesting idea but the problem is when there's more than 2 people. Often when playing split screen games you have more friends there spectating and taking their turn when the match is done. What do these people do while the 2 players are playing. If they don't have 3D glasses they can't make sense of the garbled image on the screen. Or with 3D glasses they can see only what one player's doing.
Also, considering how "niche" split screen gaming has probably become, it seems a bit much to market this gimmicky tech for that niche.