If the league has become too quarterback-centric, then a) give the defensive backs more leeway and cut back on the pass interference calls; and b) go back to traditional blocking that is very different from today’s holding (which is basically allowed as long as the blocker’s arms do not get around the outside of the defensive man’s shoulders). I don’t know when the rules for blocking (or was it just the enforcement?) got loosened up (in the seventies?) but I think it has had a big impact. But the league wants high scores which you can only get if the quarterbacks have enough time.
Probably about the same time that basketball refs quit calling traveling fouls ... and probably for the same reason.