What is the reason for KSFO PRM approaches being decommissioned?
PRM approaches require recurrent crew training, additional ATC personal (you monitor a PRM controller in addition to the tower controller), and don't increase efficiency into SFO or PHL (which decommissioned their PRM years ago) that much.  Today's airports are being built with runways separated enough to allow simultaneous ILS approaches.
In short - Training cost + Personal cost &gt; operational savings.