I admit I haven't read the article yet, and perhaps it's got a very nuanced discussion on this subject that will persuade me otherwise...
but I doubt it.
Look, it's a new thing, really. I don't know why we haven't had 'art' in VG yet, but the simple fact is that it isn't because we don't have explicit sex. (Explicit violence has been censored from VG? Uh...)
I just drew a simple classic off the top of my head. Citizen Kane has nothing approaching violence and sex, and yet it's well regarded. And although Shakespeare had violence (and bawdy puns) it's nothing that you couldn't do without being a MA game.
I could probably list a 100 movies that affected me greatly, that are well regarded, and at least half of them I'd put forth as art, and of those, at least half again would be lacking in violence and sex. Sometimes, lacking colors in your palette can ENHANCE the experience.
We're getting there. Things like Braid are a step forward. Quite honestly, though, the real problem is the lack of a broad audience. When the 40 year old gamers of today hit 60, they'll have different tastes and requirements.