re: Why doesn't every CFB team run the Air raid/Spread, etc. ?

The issue for Air raid/Spread teams is that they may be successful the first few years using this system, but defenses adapt.

Look at what happened to Urban Meyer his last 2 years at Florida or Oregon when facing good pro style teams. It is why you longer see the triple option really anywhere in football anymore, minus the spread zone read option stuff.

I like how people are using A&M against Bama as an example for this. Yes, A&M was able to shell schock Bama early, but they also allowed Bama to come back and be within 2 yards of winning that game.

Bama isn't giving up a 20 point lead to anyone with their offense.

The NFL is going more spread oriented because 75% of the draftable offensive players are coming from spread systems.

What is the biggest franchise altering position in the NFL? The QB. So when you draft these guys out of college who have barely ever taken a snap from center these offenses adjust to fit their QB's skill set.

The pro style offense will always be the most successful type of offense, but it requires skilled enough players to run it. Look at how much the offensive production has increased at Bama as the level of skill players continue to increase.