What are the odds of my boyfriends parents letting him stay with us 😭

My boyfriend and I are 17. We are in our senior year of high school. We’ve been together for 3 years. His parents told him they’re moving to Arizona for a job and we currently live in Pennsylvania. He obviously doesn’t want to move and I of course don’t want him to move either. I have convinced my parents to offer for him to live with us. We have a finished basement with a full bathroom that he can stay in. His parents are talking to my parents and they’re “thinking about it.” I just need someone to give me some hope 😓