I think just the fact that there's the potential for the player-player video to be what you'd normally see on Chatroulette and such sites makes it an automatic no-go. Unless it was monitored which would make it extremely impractical to go with it.
Not worth the time and effort if only a small minority will use it. Besides, players don't have their eyes glued to the game screen when they play. Most players switch tabs when playing the game and browsing other sites.