If your son gets the motivation to do something more productive, he is likely to move out. You could raise his rent. If you are asking me how to make him be more productive, motivation comes from a lot of places. Some people are motivated by fear, perceived risk vs. reward, or out a need. Your son currently does not have any of that going on. Inspiration can often move people to action. He’s your son, what has motivated him in the past? What inspires him? When you answer that question, you will be able to help him. Whatever his original plan was, it didn’t inspire or motivate him.