Some ideas to think about - I know this is a lot but I'm hoping that some of these could be considered (all in Dynasty Mode):
1. More coaching development: Add coaching reputations beyond overall coaching prestige - offense, defense, training, discipline, recruiting, personality, popularity, etc. Add assistant coaches to help with your duties - their reputation would directly influence your players' attributes as well as their interest in your school. Also add progressive coaching goals - become offensive coordinator, head coach, big contract, etc. that would contribute to coaches moving around - leading to my next desire, allowing coaching overhauls on all teams - not just human controlled ones. Allow CPU teams to interview and hire one of your assistants for a head coaching job, or notices that disgruntled/underpaid assistants are looking to leave. Include coaching salaries to offer more of a reason to leave one job for another (other than just to try rebuilding yet another team), and to retain top assistants. Build in a budget that serves as a pool for these salaries, that is built from ticket sales (that you can adjust), alumni donations, consessions, parking, etc. Higher ticket prices may drive fans away and lower your popularity, but winning always keeps the fan's coming back.