PGT don't have pitline, which means train will have to start from place where pitlines are there. Even PGT don't have parking space. Already memu and nil passenger is using goods yard. That was one of the reason, amrita was extended to PGTN. Chances of extending train which originate from PGT are high. Best eg is MAQ ICE(even though it was for good)
I don't think PGT div has any plan to start trains from PGT. That is another reason why POY-PGTN specials are made to run only till PGTN. But may be with 5th PF coming into serivce, we can expect few trains from PGT in newly commissioned line