For one, if this actually passed, and it won't, the warning would be in 1 cm tall letters on the bottom of any box and lost amid the copyright and trademark warnings in any digital copy.
For another, this guy needs to meet the ESRB, a group that does the best they can under zero government mandate to give the ideal warnings every consumer needs about a game.
If this guy is being lobbied by someone to do this, I have to wonder how their ignorance and stupidity can manage to raise the money to be a financial influence on this guy. Even if he is a moron, himself, I doubt he would hold his position if the likes of the ESA had a sitdown with him.