Planet Ivy: The release of G.I. Joe: Retaliation a couple of weeks ago marked the beginning of blockbuster season. Again. In the coming weeks, films like Iron Man 3, Star Trek Into Darkness and The Hangover Part III will arrive on your screens. And once again you will note the abundance of existing franchises, of sequels and prequels, parts 1 and 2, maybe even a reboot. Perhaps you, like so many others, have become disillusioned with the movies, and figure, with inflated costs, that you’ll stay home this summer. The average box-office for a film in 2012 was less than in 2011, and significantly less than 10 years ago. Fewer people are going to the movies.