I know it's been a few years since you wrote about your son. I have the same situation. My son is 18 autistic. He's very smart but can not show it on work so college seems a long shot. He tells me all the time he's leaving( nobody has told him to leave) but he never does. I don't know maybe he will one day but my thoughts are he probably will not cope well with the "world". I've told him he can stay for however long he wants and my home is always there for him. He rarely leaves the house (irony) but to scooter around the cul de sac late at night. He doesn't like people and for the last year has isolated himself away from other family members. The world is hard enough for young adults to navigate but no matter how much support I offer this 6'0 big guy refuses all help. I wonder if this is delayed adolescence or will he be isolating for the rest of his life. He used to love new adventures but all that gusto is gone. Other adults I talk to think I can drag him to therapy but we all know you can't drag someone to do that. So all I can do if offer support, love, kindness and patience. Adulthood is not turning out like I had hoped for him but I pray everyday that he has peace with himself.