I've seen that Scott Pilgrim trailer a few times and everything about it makes me completely sure that I would hate to watch it. Little George Michael has transformed from a cute smart adolescent into a big adult irritant. I'm sure he has a use as an adult actor but nobody has found it yet.
Another former cute kid that nobody has found use for as an adult is Haley Joel Osment. I thought there was a trailer out for his upcoming film Sex Ed this but I was mistaken: here's the synopsis (from THR via chud.com) instead (sorry Jet this was supposed to be a quick poke at Michael Cera but it's got a bit off topic now):
Osment plays
"a college graduate who dreams of teaching high school Algebra but due to budget restraints, ends up teaching sexual education, despite being a virgin. He discovers an unlikely mentor in a blues bar, a ruthless enemy in the local PTA, and a gorgeous Polish girl for whom English is a distant second language."
secondary source