Just another thought to clarify my idea. It doesn't seem realistic to make a player completely useless when he becomes worn out. You can't even use this guy for anything. That's not the way it works in real life. He's not dead. At least he should be able to stand out at his position.

When a player runs out of AB's, don't kill him off, just make him lousy.

A player would go from ready to overused, to very overused, to innoc.