Is the NFL turning into a passing league? NFL writers seem to think so. Take a look at this figure, plotting usage of the phrases "passing league" & "NFL" together in newspaper and magazine articles by year since 1973 (data from Proquest). It looks like usage really started to pick up around 2009.
Age matters. When it comes to drafting offensive skill players, NFL teams tend to use their early draft picks on younger prospects, a pattern that holds up even after controlling for other important pre-draft measurables. Even if coaches and GMs aren't conscious of this trend, it's still there.