A MINOR RWY INCURSION AND CONFLICT OCCURS WHEN AN ACR ACFT TOUCHES DOWN BEFORE AN ACFT EXITING THE RWY IS COMPLETELY CLR.

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I WAS ON A VISUAL APCH TO RWY 12R AT MSP. A DC-9 (Z) WAS ABOUT 3-4 MILES IN FRONT OF ME. AFTER THE DC-9 LANDED; A B727 (Y) WAS CLRED INTO POS AND 2 OTHER ACFT CROSSED THE RWY AFTER THE DC-9 LANDED. THE TFC DID NOT CLR THE RWY FAST ENOUGH AND THE B727 (Y) WAS ASKED TO CLR THE RWY AT TXWY A-9. THE B727 (Y) TAXIED AT A RATE OF SPEED THAT I THOUGHT HE WOULD CLR THE RWY. THE TAIL OF THE B727 DID NOT CLR THE HOLD SHORT LINE FOR TXWY A-9. I WAS SLIGHTLY ABOVE THE GLIDE SLOPE AND LANDED. I FELT I HAD ADEQUATE LATERAL AND VERTICAL SEPARATION TO MAKE SAFE LNDG. THE TAXI SPEED OF THE B727 (Y) CONVINCED ME HE WOULD CLR THE HOLD SHORT BEFORE WE LANDED. THE B727'S (Y) LNDG GEAR WAS CLR OF THE HOLD SHORT LINE AND THAT TRIGGERED ME TO THINK THE ACFT WAS CLR OF THE HOLD SHORT LINE. A GAR SHOULD HAVE BEEN INITIATED EARLIER. I SHOULD HAVE ERRED ON A MORE CONSERVATIVE SIDE AND NOT PUSHED IT TO THE SMALL LIMIT THAT I DID. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR NOTED THAT ONLY A PORTION OF THE B727'S TAIL WAS ACROSS THE HOLD SHORT LINE; AND THAT THE HOLD LINE ITSELF WAS WELL SET BACK FROM THE RWY. HE ALSO CLAIMED THAT USE OF THE 'GND SPEED MINI' AUTOFLT FUNCTION RESULTED IN A GND SPEED PERHAPS 10 KNOTS FASTER THAN OPTIMIMUM FOR TFC SPACING IN THESE CIRCUMSTANCES. UPON REFLECTION; RPTR SUGGESTS THAT A SLIGHT 'S' TURN ON FINAL WOULD HAVE PROVIDED THAT REQUIRED SPACING AND THUS AVOIDED THE PROB. HE DOES NOT BELIEVE THAT A GAR WOULD HAVE BEEN SAFER.