Where do questions of removal of engagement freeze come from? The engagement freeze has been five years for at least two decades. I cannot see that reducing. If anything, I expect they would like to see it increase.
As for 747 retirements; yes hull numbers have been reducing, but we are years away from people being directed off or released from freezes. In fact at the moment, they cannot get people trained onto it quickly enough!
Are you saying you have been offered a 747 course but you do not really want it?