I think when guys change their swing there is a typical progression. Changes swing because they are struggling. Gets better results initially. People freak out. Then they regress and end up where they were before or worse. People freak out again. The key then is do they lose faith and abandoned everything they've been working on or do they trust the work and commit to the new swing (pitch, arm slot, Yada yada). That's when you typically see if it has staying power. Can they get back up to a spot where they are better than they were before. Batter changes something, pitchers make adjustments, batter struggles, but can they make more adjustments to get back ahead of the pitcher. A constant battle!
I'm happy he's doing this and I do think it could have a pretty solid impact for him.