It isn’t about whether to move, but when. While I agree with those saying you should do what you want to do, if you have some flexibility, waiting until his sophomore year in college may make it less difficult for your son. I would also think about what he could do for a job in your new location and whether you think he will be likely and able to live somewhere else after freshman year of college. My youngest came home that summer, but stayed in his college town doing research the following summers. He got a job at a camp through a friend connection. Not sure how easy it would have been for him to get an internship after freshman year or even a just a job without any contacts.
If you do want to move next year, you may consider having to support him at college for the summer if he can work on campus or something, especially if you move to an isolated area.
That being said, you have to decide what is the best timing for the two of you. He will be fine either way. And, as others have said, may end up not coming home for the summer after freshman year anyway.