What would make SWTOR great (again)?

Hey everyone! I just got back into the game after about a two year long break. I am finding that there are a lot of things for me to do and that leveling up has never been easier. I have not reached end game content quite yet, but I am looking to start that in a few weeks. I have noticed that there has been some uptick in player numbers since the movie came out (me included). So, that brings me to my question for everyone. All these new people and returning players are now coming to the game. What should keep them here? What do you think it would take for both new and old players to stay? What really could make the game great (again)?