I don't particularly think gaming will ever mature past the level it is now.
Good.
Gaming, at it's most basic, allows us to live out our fantasies. And, unless you're the most boring person on the planet/never had a childhood, you can bet that most peoples fantasies will either involve sex, violence, improbable feats or some combination of the three. Gaming can be very mature when it wants to be, and sometimes it works, sometimes it doesn't, but is there really any problem with killing lots of people in the most violent way possible? Assuming you're old enough to play it. No, there isn't. It's fun, and that's all there is to it. Sure, people will say it's immature and morally reprehensible, but who really cares? The games still get made, and they're still fun. You're making a bunch of pixels fall over. And it's fun.
Movies, although touted as more 'mature', are almost the same. I challenge you, look through your DVD collection for films that involve no sex, blood, violence of any kind or swearing. There will be a few, but I bet they'll be massively overwhelmed by the amount of titles that involve one or all of the above. Hell, back in the 'good old days', films, books and theatre were just as violent. The only thing stopping them from being really violent were the same kind of puritans that today hark back to them as some sort of golden age.
Gaming is for entertainment. It doesn't need to be any more mature, especially if we go by the definition of mature that non-gamers want it to be, that is, boring! That doesn't mean games can't be art, but as far as I see it, games are fine as they are.
nice article.