PLT OF ACR FLT ON SHORT APCH TO BOS RWY 27 FEELS THAT; HAD A GAR BEEN NECESSARY; A CRITICAL AIRBORNE CONFLICT COULD HAVE DEVELOPED WITH EITHER OR BOTH ACFT CONCURRENTLY DEPARTING OFF RWYS 22L AND 22R.

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ON APCH TO RWY 27 BOS; WE WERE FOLLOWING A B777; 5 MI IN TRAIL. AT ABOUT 700-800 FT ON GS; TWR CLRED; ALMOST SIMULTANEOUSLY; 2 ACFT FOR TKOF ON RWYS 22L&R. MY POORLY DRAWN DEPICTION OF WHAT I SAW AS A POTENTIALLY DANGEROUS SIT AFFORDED US VIRTUALLY NO OPTIONS (SAFE) IN THE EVENT THAT WE HAD TO GO AROUND AT 300-400 FT. IF WE HAD PROCEEDED STRAIGHT OR L WE MIGHT HAVE IMPACTED THE RWY 22L ACFT. IF WE HAD TURNED R WE MIGHT HAVE IMPACTED THE TRAILING RWY 22R DEP. IT BROUGHT TO MIND THE NEAR HIT ESCAPE MANEUVER WHICH TOOK PLACE RECENTLY AT LGA; ONLY THIS TIME WITH 2 INTRUDERS. I REALIZE THAT THE TWR IS UNDER A LOT OF PRESSURE TO KEEP THOSE DEP/ARR NUMBERS UP; BUT SANITY NEEDS TO PREVAIL. EXACTLY A WK AGO A FRIEND OF MINE BASED IN BOS HAD 2 REJECTED LNDGS IN BOS ON 1 ARR IN ALMOST THE SAME SCENARIO. IT CERTAINLY GIVES YOU PAUSE FOR THOUGHT AS WE AS AN INDUSTRY ARE EVALUATING LAHSO ESCAPE MANEUVERS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT A FELLOW PLT WITH HIS AIRLINE; EXACTLY 1 WK PRIOR; HAD HAD TO MAKE 2 GARS; UNDER VERY SIMILAR CIRCUMSTANCES; BEFORE FINALLY LNDG SUCCESSFULLY ON RWY 27. HOWEVER; 1 OF THOSE GARS WAS; ACCORDING TO RPTR; THE RESULT OF IN TRAIL SPACING PROBS. HE DOESN'T KNOW WHAT CAUSED THE OTHER.