ACR LGT FORCED TO MAKE GO AROUND WHEN PRECEDING ACFT DID NOT CLEAR RWY IN TIME.

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PARALLEL APCHS TO RWYS 28L & R WITH 2 ACFT SPACED WINGTIP TO WINGTIP ARE DANGEROUS AND ARE ALL TANTAMOUNT TO NMACS. IT IS VERY HARD TO FLY A PRECISION ILS FLT PATH WITH THE DISTR OF ANOTHER AIRPLANE DIRECTLY ABEAM AT SAME ALT. IN XWIND CONDITIONS; IT IS EASY FOR AN AIRPLANE TO DRIFT TOWARD THE OTHER FLT PATH AND COULD POTENTIALLY RESULT IN A MIDAIR COLLISION. IN ADDITION; AIRPLANES ARE SOMETIMES SPACED TOO CLOSELY IN TRAIL. I HAD TO MAKE A GO AROUND ON APCH TO RWY 28R (9/THU/88) BECAUSE THE AIRPLANE AHEAD DID NOT CLR THE RWY. THE TWR DID NOT INITIATE THE GO AROUND; AND AT 100' AGL I HAD TO MAKE THAT DECISION. SFO IS GETTING TO BE A DANGEROUS PLACE TO FLY INTO. SUGGESTION: DISPLACE THE LNDG THRESHOLD ON RWY 28R BY AT LEAST 4000'. THAT WOULD STILL ALLOW OVER 7000' TO LAND ON AND PROVIDE SOME VERT SEP (ABOUT 210') BTWN APCHES TO RWYS 28L & R. ALSO; THE RWY 28L G/S COULD BE REDUCED FROM 3 TO 2 1/2 DEGS; AND PROVIDE AN ADDITIONAL 340' VERT SEP AT THE OM (TOTAL OF 550') WHICH WOULD BE VERY COMFORTING TO PLTS COMPARED TO THE DANGEROUS SITUATION WE NOW HAVE. ANOTHER MORE EXPENSIVE LONG TERM SOLUTION WOULD BE TO FILL IN THE BAY N OF THE ARPT AND BUILD ANOTHER PARALLEL 28 RWY (N OF APCH END OF RWY 19L & R).