They need a KOTOR III to wrap things up where everything left off. Like Revan's search and for his return. I haven't played the game for a while but I am sure there is more. Like the people that he trained to be jedi.
I don't believe it is impossible to assume there will not be a KATOR III. I just haven't heard any announcement from Lucas Art's naming any company developing it. I hope there will be and that it will be completely first person.