As for him not having made a movie since 2006 - what has the director of The Avengers done since that year?!
Written and produced Dollhouse, a TV series which lasted two years (Whedon also directed a few episodes).
Whedon has also directed two episodes of The Office
and an episode of Glee
Written a horror movie that has been completed for a while (The Cabin in the Woods
Wrote and directed a popular online video series (Dr. Horrible
So, yeah, I don't really see your point.