Yes, i also have that feeling, that they are trying to clean the veterans players, starting with the New market idea.
New players Will only knew the New one, for them Will be natural, forcing them to buy scouts.
Cleaning the old active managers, Will also reduce the numbers of players in market for sell, Will also reduce the space needed in servers to keep the team historys and so on.
Thats Why they are giving the oportunity to change team, for levels below. The idea is you reach season 7-10 you start to get bad results and got borde, so Why not start again. More active teams in lower levels and no stop the nessecity to create New leagues above.