Why does this matter? First, the percent of plays that go for more than 25 yards correlates strongly with both points per game and points per possession (r=.68 &.70)- teams that get explosive plays score more points. Its hard to move the ball down the field with 3 yards and a cloud of dust. For example, last season all of the teams in the top 5 in scoring (points/game) were outside of the top 25 in plays/possession, and all five of the top teams in terms of plays/possession were outside of the top 25 in points/game.
Second, pass plays are about 2.5 times more likely to go for more than 25 yards than running plays, but they are also about 2.5 times more likely to go for 0 or negative yards (when we count sacks as pass plays). So, from 2007 to 2011 West Virginia has had to run twice as many pass plays in order to get 80% as many explosive plays. This exposes them to more unproductive plays (<=0 yards), which have increased by 25%. This amounts to losing 3/4 of a point on average per possession. This might not seem like a big deal, but it is enough to cost an up-tempo team 12 points per game and a low-tempo team about 8 points per game. West Virginia is still a good offensive team, but 8-12 points/game is the difference between a good team and a title contender.