Currently it is very difficult to transfer all flights to a new terminal. If you have 250,000 or so passengers that is a lot of routes to go through and change, even harder if you dont want to change the flight number group and service contracts of every flight.
There should be an option that lets you move all flight ops to a new terminal.
There should also be a way to have a contract greater than 120,000 passengers so you don’t have to have more than one if you have over that amount.