Unfortunately that would be very easily abused. As it stands an FC Master can be a troll if they want and throw a fit and kick someone, breaking their Private Rooms and booting their chocobo. What you're asking would be the ability to just randomly break peoples' rooms (the cho thing isn't as big a deal). If I didn't log in for a day or two due to RL and came back to my room broken because my FC Master was too antsy about the new land plot to wait for me to collapse my own room I'd be kind of pissed. You can recover more of your stuff if you destroy your own room. The proper way to handle this situation is to gauge when you're likely to get the gil and tell people to pre-emptively leave their rooms and remove their birds.