I think it has more to do with the move to recruit faster defenses. It's the Oregon effect. The Pac12 has fallen in love with finesse offense and small, nickel defenses.
Interesting theory. However Washington did not get beat today because their defense was steam-rolled ( although it did happen some in the 4th Q). They did not have a chance in the game because of their inept offense.
They only had a 190 yards of offense and crossed the 50 yd line only once in the game before they managed to cross it again with only a minute left in the game.