It's not good when a player is struggling badly enough that you want to do something drastic like this. Definitely a negative indicator for the future.
Sometimes when I see a guy struggling in the minors, you will think or hear that "there's time for him to improve" and other such hopeful things. But I'll wonder, who are the guys who had a legitimately hard time in the minors or had a particular problem and actually rallied back and solved it? Most players who have a horrible season in the minors are just not good and that's that. Saying that a guy is young and there's time to fix it can feel a lot like cope. [Side note: a large portion of the major turnarounds in quality of play seem to be pitchers]
So I appreciated Getz mentioning Geraldo Perdomo and Barfield's experience with him in the AZ organization. Perdomo hit a hard wall in AA and was putting up numbers rather similar to Colson there (Perdomo struck out less, but still a lot for a hitter with a lot less power than Colson). Arizona sent him to extended spring for an entire month to work on his mechanics and let him clear his head. And then he went on a rampage, posting a .930 OPS for the rest of the season across AA and a brief promotion to AAA. He even had a strong week of hitting in MLB as a September callup. Given that Perdomo is a completely solid MLB starting SS, I accept that as a nice success story and a sign that this kind of move can work. There's also a warning in there, I think: Perdomo had a horrific first full MLB season the following year before an all-star sophomore effort, so this roller coaster may have multiple peaks and valleys.