Should this pass, the next logical step is as follows:
A gamer sees a warning box on his copy of the new release Mass Effect 3, "WARNING: ..." but then in the same store, in the same department suddenly on the television comes on one of those epic advertisements and he totally forgets about the warning, he want to save earth and defeat the reapers!
Little did he know, the same congressmen will observe this, then move to ban advertising of video games like they did with tobacco products.
We need to stop blaming video games and call the problem what it is - bad or ignorant parenting. You don't need a warning label, parents rarely even look at the ratings on the box as it is now... they just want their kid to shut up so they can be left alone, so they placate the child. There are websites dedicated to evaluating films, books, and games with the sole purpose of educating parents so they can can a tally of how many times the f-bomb is dropped in a film or game without having to evaluate it personally. The tools are there, use them, take responsibility, and put blame where it ought to be.