Perhaps he's bitter that he's not having sex with "Lara Croft" anymore...?
Okay, seriously, there have been bad movies for a long time, and there have been movies that have been lacking an attention span for a long time, and there have been movies with little to no respect for the intelligence of their audience for a long time. If one really thinks that movies have suddenly become especially lacking, and one is in a position of some respect in the Hollywood community, one's responsibility then is to make a better movie, not to trawl shallow for a scapegoat.
Welcome to the "those damn kids" age demographic, Thorton.