ACR FLT CREW EXITING AND NOT CLR OF RWY AT TPA IS CONCERNED WHEN TWR CLRED DEP FOR TKOF.

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WE WERE CLRED TO LAND ON RWY 18R AT TAMPA. DURING LNDG ROLLOUT; AT 80 KNOTS; I STOWED THE THRUST REVERSERS. AT ABOUT THE TIME THEY WERE STOWED; I HEARD TWR CLR AN ACR Y ACFT FOR TKOF ON RWY 18R. THE FO TOLD TWR; 'ACR X STILL ON THE RWY.' TO WHICH TWR RESPONDED; 'DIDN'T I CLEAR YOU FOR TKOF?' MY FO RESPONDED; 'YOU CLRED US TO LAND.' TWR MADE NO ATTEMPT TO STOP THE ACR Y AIRPLANE FROM TKOF. I LOOKED FOR THE NEAREST EXIT; AND HURRIED OFF. AS I TURNED; I LOOKED OVER MY SHOULDER AND NOTICED THE AIRBUS SEEMED TO STILL BE IN POSITION AND NOT MOVING. AS I EXITED THE RWY; I COULD NOT CONTINUE BECAUSE THERE WAS ANOTHER AIRBUS TAXIING IN FRONT OF ME; PERPENDICULAR TO MY DIRECTION OF TAXI; HOWEVER; AT LEAST I WAS CLR OF THE RWY; EVEN THOUGH I WAS NOT PAST THE HOLD SHORT BARS. (THIS IS NOT CLR AS I UNDERSTAND IT; BUT I WAS SAFE). THIS IS CLR EXAMPLE OF A TWR CTLR NOT PAYING ATTENTION. BUT WHAT IS EVEN WORSE; IS AFTER WE TOLD THEM WE WERE NOT CLEAR; HE MADE NO RADIO CONTACT WITH THE AIRBUS THAT HE HAD JUST CLRED FOR TKOF. THE CTLR SEEMED CONFUSED AND BEWILDERED. WHAT WOULD HAVE HAPPENED IF THE VISIBILITY HAD BEEN 1/2 MI AND THE AIRBUS CAPT HAD NOT SEEN US? THE ARPT WAS NO BUSIER THAN NORMAL; JUST ROUTINE EVENTS. THIS WAS A CLASSIC EXAMPLE OF ATC TWR NEARLY CAUSING A MAJOR ACCIDENT BECAUSE OF LACK OF ATTENTION.