The thing to keep in mind is that when you implement this it's not like each starter could go 100 pitches if they wanted, they'll be throwing fewer pitches less often, like a more important long reliever. In any case, the situation will dictate when the change is made, how well he is pitching, how close he is to tiring, at what point he comes up, and how many runs the offense is scored all play a part in making that decision. I like the idea in principle. I think it might work well to team a young guy with a guy like Maddux or Glavin or Al Leiter who is pitching toward the end of their career. Leiter was very effective for about 4 inning toward the end of his career.