The way this article is written, I find it to ring of propaganda . The way the article is written, it sounds like the author is trying to say that excessively violent games SHOULD be allowed to be sold to minors(so the game development community can make more money). I don't think that is the exact sentiment the author "wishes" to convey, but that's how it comes across to me. It is not unreasonable to restrict minors' access to extreme media, in much the same way as with R-rated movies, and it is not unreasonable to have some enforcement of that restriction as long as it is being applied universally to all media. But the way the article is written, it comes across to me as "mean ol' California/Schwarzanegger wants keep us from selling violent games to anyone, and so we can't make a lot of money."
Probably more what the author "wants" to say(or perhaps the way the author should have made the case) is that such additional laws as California are proposing are really unnecessary because a sufficient system and set of laws already exists to inform people of the content of games and restrict minors' access to the more extreme productions. The information exists both online and on the game box itself, if people would take the 2 seconds required to turn the box over and see the very prominent rating and content label. For many games, a big age-appropriateness label is already also printed on the front of the box. There is no need to encumber businesses with further restrictions beyond what would normally be done for any other media, such as movies, nor is there a need to apply further labeling(if people aren't going to pay attention to the big labels on games now, adding more is not going to do anything).
Also, restricting sales is not the same as restricting production, and this idea of a "chilling" effect on free speech is bogus because the only "chilling" effect there will be is on the sales figures each quarter(instead of being able to sell Hyper-Violent Head Rippers to everyone age 5+, Hyper-Violent Head Rippers can only be sold to those 17+ in age, in accordance with the already existent MC-17 or AO rating such a game would be given).