Why do movies suck so bad (at the moment)?

Obviously not all movies of the last year suck: Just the last two months, we were graced by movies like Black Swan and True Grit. But the mass of movies seem to be terrible, terrible comedies, films about young vampires and sequels of sequels. Why is that? Mark Harris has the (longish) answer at GQ, of all places. It's the perfect storm of demographics and marketing, and although the usual suspects crop up, the (no-longer-)cinema-going public is also to blame.