Did you know…
Before the league switched to a 16-game season in 1978, only one NFL quarterback threw for over 4000 yards in a season?
Joe Namath threw 4007 in 1967.
In the 1980s there were thirteen 4000+ yard seasons (Dan Fouts also threw for 4082 in 1979). Plus, Dan Marino broke 5000 yards in 1984.
In the 1990s there were 20.
In the 2000s there were 46.
Roughly doubling every decade since the 1980s, that means 190 in the 2020s, or, 19 quarterbacks throwing for 4000+ yards every season. In 2013, only 19 QBs have started every game for their team.
I don’t expect things to get as crazy as my fuzzy math predicts. However, considering the continued safety concerns in the league, it might not be so far-fetched.
(here’s the Pro-Football-Reference list of single season passing yardage leaders)