This is my thoughts on it, maybe I am overestimating, but I think it would be enough to keep clubs afloat.
Say for instance Dunfermline sell 1200 season books for the upcoming season, (based on half the amount they sold last season and some fans are generous to their clubs) plus say 800 Dunfermline fans round the world paying for the Pay per view and say 1200 Dees round the world paying for the pay per view, you could have an online attendance of around 3,200. That is only 500 less than last season's attendance.
Take away stewarding and policing costs.
Lower player contracts, as every team will have to do.
There might be the possibility at the time of small groups of hospitality?
Advertising could not only still be done around the ground but also during the online game along a banner at the bottom as well as adverts at half time.
Like I said, I maybe am being optimistic, but I am just trying to look at it from a different light.