I agree with Southwest_Dave that Park Service does not seem to make much effort to re-open. I'm sure it's less work for them with it closed and there is some danger for an unaware driver going off the road due to ice in area with no cell phone service and temps predicted to be in the teens at 6000' and as low as 5*F Sunday at Mammoth main lodge, elev. 8900'.
Mammoth is scheduled to open on 11/10. The question is whether it will be one lift and run on man-made snow or more. There currently is no new snow predicted in the next 10 days.