To simplify things:
Club has sold 13000 season tickets and say they are as an example £300 each.
This means the club earned £3900000 in season tickets sales.
If the club moves and say 8000 of these people decide they can not go to where ever the new ground is then this reduces the amount City have earned by £2400000. This will then leave a £2400000 hole in the budget for the running of the club.
It doesn't matter when the club may get the cash, it's the fact that they won't have that cash is the issue.
Of course. I was merely answering the point about monies received to this point in the context of refunds that are being requested now, but those refunds are for match tickets anyway for games that will hopefully be played and for which the money would have have been received.
Gonna be so damaging if we have to start refunding season tickets though. What a fucking mess.