I think it's more about the disappointment of losing a player to one of the bigot brothers. I imagine most fans would be happy to see him succeed if he was moving to almost any other club, but don't want anyone to succeed with that mob.
I wouldn't be surprised to see Cadden move on in the summer, but at least from his interviews, he seems to have been quite happy sticking with us. Despite the fact that it feels like has been around forever, it's easy to forget Cadden is only 22.