No problem with this. John is moving on to some other of life's challenges.
John's in his late twenties, and some will feel that he's leaving the game too early, but not me. They said the same of Jean Balukas nearly thirty years ago when she retired in her late twenties. While noone can suggest that John's accomplishments are even close to being on a par with Jean's, it's easy to overlook that these two players had long, not shot careers, for each competed as a junior and went on to play for many years at the game's highest level.
John was a fine player and a positive role model for all pool players and, for those reasons, he will be missed.
Whatever comes next for John, I wish him the best. If he applies himself in future endeavors the way he did as a pool player, good times surely lie ahead for John.
Good luck, John.