I agree some won’t, but I think many will. It’s like anything else: not 100% of everybody reacts to sudden change the same way. We see that with the pitch timer right now.
I would imagine pitchers trying to make their mark, or trying to hang on to their 13th-pitcher jobs, would continue to try to throw it through the wall to impress management and increase their usage or stay on the team. Guys who are more secure, especially those with long-term contracts, would probably be more likely to figure out how to effectively ease up and save their arms for their future.