Play College Hoops 2k8 and you will see why it is a much needed feature. A coaching carousel adds depth and long term playability to the dynasty mode. Currently the dynasty mode offers game little reason to play it long then 3-4 years in. NCAA 11 showed us how messed up the mode is. Just look at any of the threads which detail the records of schools years into a dynasty. The same teams are good year in and year out and there is very little change over a 30 year period in the game. With a coaching carousel you have coaches getting fired, moving to new jobs and finial retiring so no more Joe Pa coaching until he is 110 years old. This allows for teams to rise and fall just like in real life.
To make all this work like it should then the game would have to have coaches who have ratings and system linked to them. The system and tendencies are already in the game but need to be tweaked to work better then they do. To coaches are in the game now but they only show up on one screen and have zero meaning. In real life the coaches are the biggest part of the program. A great coach can turn around a program. See Urban Meyer for a prime example. He took over a Florida program that had fallen to the middle of the SEC and turned them into a 2 time national champ in 5 years. He did it by bring in his system, recruiting like on other, then coaching his players up. The game lacks that but could be done. You give each coach ratings which effect offense, defense, recruiting, progression. This would allow for a program to bring in a Urban or Steve Sabin to turn around the program or a Ron Zook to kill a program.
As far as adding coaches names that fix is easy. You just keep them the way they are now, Coach___(team name here), but allow the user to full edit them like now. The only change is some how making the coaches part of the roster file so you can save them. The way it is now allows us to edit the names but can't save the file so for every new dynasty one would have to edit the names every time. If the coaches had their own section outside the dynasty mode then we could not only edit names but also edit their playbooks, tendencies, and even the type players they recruit per position. Some of that stuff is in the game now but just not done correctly.
The main goal of the coaching carousel is to give the dynasty mode long term playability. It prevents the mode from becoming boring due to change. I have been playing Choops2k8 for 4 years now and still have my original legacy going. I play it all the time. I'm 20 season in of a 30 year career. I can say I have not once seen the same programs at the top year after year. I have seen programs rise up and have great runs but then the coach leaves or retires and the program falls off because they make a poor hire. I have also seen the opposite of that where the right coach comes in and take the program to new heights. It makes the gamer want to play the game. It adds to the gameplay because the coaches have an effect on the game. This is a feature people have asked EA to put in for years but they fail to do it. If they ever want to take the game to the next level then they will have to put it in and build it up.