So...people weren't throwing nearly as frequently, but it was impossible to do so back then?
Shit logic. Has YPA really changed much since then?
Nope, when you look at the single-season YPA leaders, you see players from every era. The only thing different now is that people throw more frequently, they aren't particularly more successful throwing now.
http://www.pro-football-reference.co...gle_season.htm
26 times has a player thrown for 9.0 YPA or higher. Marino's 1984 was one of them.
Only 3 of those 26 seasons were in the 2000's. (Rodgers '11, Peyton's '04, and Warner's '00). It was done twice in the 90's, four times in the 80's, twice in the 70's.
As many people had a 9.0+ YPA season between 1980-1989 as did between 1990-2010. If anything the 80's were the aberration.