TXWY SCENARIO AT BOS NEARLY RESULTS IN COLLISION BTWN A B727 AND AN AIRBUS.

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WE LANDED OUR B727 ON RWY 27 AT BOS. WE WERE FOLLOWING AN AIRBUS AND THERE WAS AN ACFT FOLLOWING US. THE AIRBUS EXITED RWY 27 ON TXWY W TO HOLD SHORT OF RWY 22 FOR LNDG TFC. WE EXITED THE RWY ON TXWYS; ALSO HOLDING SHORT. TO INSURE OUR TAIL WAS CLR OF RWY 27; WE PULLED AS CLOSE TO THE RWY 22 HOLD SHORT LINE AS WE COULD. WHEN THE RWY 22 LNDG TFC WAS CLR; THE AIRBUS WAS CLRED TO CROSS RWY 22. AS THE AIRBUS PULLED FORWARD ON TXWY W; WHICH CONVERGES WITH TXWY S; HIS WING TIP CAME VERY CLOSE TO OUR FUSELAGE. THE AIRBUS CAPT COULD SEE OUR THUMBS UP SO ALL WAS OK. IF WE HAD BEEN A WIDER OR LONGER ACFT THERE COULD HAVE BEEN A COLLISION. WE MENTIONED THE CLOSENESS TO THE GROUND CTLR WHO SEEMED NOT TO BE CONCERNED. ATC SHOULD NOT HOLD TWO ACFT ON THESE TXWYS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED HE FILED A RPT WITH COMPANY AND HAD A DISCUSSION WITH HIS CHIEF PLT ABOUT THE PROB. HE SAID THE CHIEF PLT WAS AWARE OF THE PROBLEM WITH SIMULTANEOUS USE OF TXWY 'S' AND TXWY 'W.' HE ALSO SAID BOS HAS HAD SIMILAR INCIDENTS ON OTHER TXWYS. RPTR BELIEVES; BECAUSE OF THE LOCATION OF THE HOLD LINES AND CONFIGURATION OF TXWY 'S' AND 'W;' IT MIGHT BE SAFER FOR GROUND CTL TO MOVE TRAFFIC HOLDING ON TXWY 'S' FIRST. THE ACFT ON TXWY 'S' WOULD THEN BE MOVING AWAY FROM THE ACFT ON TXWY 'W.'