How would that help? If I were fighting city hall about upzoning and they went and upzoned my property anyway, I'd likely sell my newly increased value property

How would that help? If I were fighting city hall about upzoning and they went and upzoned my property anyway, I'd likely sell my newly increased value property to someone else (or have it be ED'd at a higher compensation) and then move somewhere that still has single-family zoning. Whether one has been fighting upzoning or not, they are still entitled to the higher value.