You can have all the talent in the world, but if you don't have a coach to put the talent in places to succeed -- you are going to struggle. That's what has happened at Texas, at USC, at Florida, at Florida State.
The difference between Texas, USC, Florida, Florida State, etc. -- They CAN bring in elite recruiting classes because they are located in states with a ton of blue chip talent. Nebraska could bring in Nick Saban as their HC and they still wouldn't be able to recruit classes like Georgia, Bama, LSU, OSU, etc. So those schools ARE just a coach away from being able to compete nationally. Unless Nebraska talks Warren Buffett into buying them a top recruiting class (ala Texas A&M) -- they won't ever be signing a class like that.