Oh, for the love of all that is right and holy ...
Let the kid take a break from troop life! I've seen so many "wrecked" teens who were in this for their dads or grandpas. Maybe you have an exit plan, but I've seen plenty of dads who don't, here are some steps:
Thank him for telling you this early rather than holding it in. Invite him to keep doing that going forward.
Make it clear that if he wants to limit his scouting activities, he can. If he wants to resign from the troop, this is the perfect time to do it before they recharter him for the coming year.
Tell him he