The only way vish I can see them going is a fans campaign and a boycott of the club but that would hurt the team.
If FSG feel they have lost the goodwill they may go but it never worked with the glaziers so I really don't know.
A revenue reduction will definitely work as they will then understand that growth in revenue can be achieved when there is success on the field, you need to invest to get returns, so if you are right and tickets are not bought, they will feel it.