It is commonly believed that Luffy will destroy the WG after he learns the True History on Laughtale. Problem is, Luffy never is motivated by abstractions. He went after Arlong because he saw that Nami was in pain. He went after Crocodile for Vivi, and so on. So who will make him go after Imu? It could be that Imu is right now torturing Vivi or Hancock. It could be that Hancock was abused by him/her when she was a slave in the past. Luffy could meet someone else, who has history with Imu. What is your guess?