We are moving towards a time where the manager is a head coach and he gets to work with the players provided to him, he tells the transfer team what type and kind of players he wants and he gets them given to him.
Look at the quotes from the swansea manager
http://www.bbc.co.uk/sport/football/36280188
Its a similar system at Tottenham, and at Liverpool.
What you have then is a system where, when you get rid of a manager, you dont then get a new manager coming in wanting to get rid of what it there, and bringing in his guys at the cost of millions every year.