re: Will 1 full season be enough to know if coaching change was the right move?

Only if it's a terrible season, then we'll know it was a bad decision. If he does well it could still fall apart if he can't manage the whole program. That's what happened to Archer. He took over a machine that Arnsparger had built. LSU was loaded with talent. He went 10-1-1 and finished #5 in the nation, I believe. Then his inability to recruit, and to maintain discipline, drove the program into a ditch.

I'll add that if he wins the national championship it will vet the decision to hire him. Even if he drives us into a ditch after that it would have been worth it to me.