CLOSE PROX ACR-LGT ON LNDG ROLL AND ACR-MLG ON SHORT FINAL TO CROSSING RWY.

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I WAS F/O ON FLT; 8/88; FROM ATL TO CHS. WE WERE CLRED FOR A VISUAL TO RWY 15. AT 4 MI; ON FINAL; WE SIGHTED AND QUESTIONED THE TWR ABOUT AN ACFT APPARENTLY APCHING TO LAND ON THE INTERSECTING RWY 21. TWR ADVISED THAT THE ACFT WAS CLRED FOR A VISUAL APCH TO RWY 21 AND WOULD S-TURN SO AS TO LAND ON RWY 21; AFTER WE CLRED THE INTXN OF THE 2 RWYS. AT THAT POINT; IT APPEARED TO US THAT; EVEN WITH S-TURNING; THE CREW WOULD NOT BE ABLE TO SLOW ENOUGH TO SPACE THEMSELVES PROPERLY TO LAND ON RWY 21. WE FELT THAT THEY WOULD DISCONTINUE THEIR APCH. AFTER A NORMAL LNDG; TWR REQUESTED US TO EXPEDITE THROUGH THE RWY 15/21 INTXN; WHICH WE DID. HOWEVER ACR B HAD CONTINUED TO APPROX 200' AGL AND THE RWY 21 THRESHOLD PRIOR TO ANNOUNCING AND EXECUTING A MISSED APCH. THE JET PASSED APPROX 500' BEHIND AND 200' ABOVE OUR FLT. DURING TAXI IN; I COMMENTED TO THE CHS GND CTLR THAT WE HAD DONE OUR BEST TO EXPEDITE THROUGH THE INTXN AND THAT IT HAD NEVER LOOKED LIKE THE SPACING WOULD WORK OUT FOR THE VISUAL. THE CTLR COMMENTED: 'THE SPACING NEVER LOOKED GOOD TO US; EITHER.' HOWEVER; THE TWR NEVER CALLED FOR ACR B TO GO AROUND OR SUGGESTED ANY OTHER ALTERNATIVE SUCH AS A 360 DEG TURN FOR SPACING. AT THE GATE; WE HAD SEVERAL NEGATIVE PAX COMMENTS ABOUT THE PROX OF THE JET. WE FELT THAT THE ACR B CREW EXERCISED POOR JUDGEMENT IN CONTINUING THEIR APCH WHEN IT WAS ABSOLUTELY CLEAR THAT THE SPACING WOULD BE INADEQUATE TO COMPLETE A LNDG. ALTHOUGH THE MANEUVER PROBABLY DID NOT COMPROMISE SAFETY OF FLT; IT DID UNNECESSARILY CAUSE CONCERN AMONG OUR PAX (AND PROBABLY THEIR'S; ALSO).