A C172 PLT; AFTER LNDG AT A NON TWRED ARPT; OBSERVED ANOTHER ACFT TAKING OFF PRIOR TO HIS CLRING THE RWY.

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JUST PRIOR TO XING THE THRESHOLD ON FINAL APCH TO RWY 34 AT PIERCE COUNTY ARPT; PUYALLUP; WA; THE C152 ANNOUNCED HE WAS TAXIING INTO POS AND HOLD. UPON MY TOUCHDOWN AND LNDG ROLLOUT; HE ANNOUNCED DEPARTING. I LOOKED OUT THE REAR WINDOW AND SAW THE C152 ACCELERATING TOWARD ME. I ADDED PWR AND TURNED TOWARD THE TXWY; WHICH I WAS STILL APCHING. I LOOKED OUT THE SIDE WINDOW TO SEE THE C152 ROTATING TOO CLOSE FOR COMFORT! I AWAITED TO SEE IF THE ACFT WOULD RETURN TO 1S0 AND IT DID. I POLITELY AND PROFESSIONALLY WENT AND TALKED TO THE PLT ABOUT WHAT HAD OCCURRED. HE AGREED IT WAS UNSAFE BUT ALSO SAID HE HAD BEEN WAITING TO TAKE OFF FOR QUITE SOME TIME AND BECAME IMPATIENT. HE ALSO COMMENTED THAT HE WOULD NOT DO THAT AGAIN. PREVENTION OF THESE TYPES OF RWY INCURSIONS IS PROBABLY IMPOSSIBLE. I THINK A STEP IN THE RIGHT DIRECTION WOULD BE TO ADD A REG PREVENTING ANY ACFT AT AN UNCTLED ARPT FROM TAXIING ONTO AN ACTIVE RWY OCCUPIED BY ANOTHER ACFT WHICH IS IN THE PROCESS OF TAKING OFF OR LNDG. AT LEAST IT WOULD BE A DETERRENT.