Writing emails to players is obviously impossible, but I've wondered to myself a few times if it might not be a bad addition to the game to be able to promise minutes to a player you currently have. For instance, you have a Soph complaining, and you know you aren't going to be able to fulfull his minutes desired. But you also view him as a contributor next season, and dont want him to leave. As such, you make a minutes promise for next season just like you would a recruit, with all the same repercussions. Then that promise factors in to whether he sticks around.
Very low on my list on things I'd like to see, but just throwing it out there.