I don't know what you lot base your expectations on.
These are the H&A crowds Souths v Manly that were bigger than tonight, at any ground (they just all happen to be at the SCG):
R7 S.C.G.44911 08-May-1971
R17 S.C.G.27130 20-Jul-1968
R6 S.C.G.30283 27-Apr-1968
R22 S.C.G.33506 22-Aug-1970
So tonight's crowd is the fifth (almost fourth) highest out of 121 games since WWII, ie. in the top 5%, the highest in the last 40 years and probably a good 10k higher than the last 10-15 years average.
And it is barely a pass mark?
Too many dreams in this thread, not enough reality.