I don't really disagree with _most_ of what's been said above, but I do have a different take.
It sounds like he's overmatched by the level of talent on the other teams, not by the level of talent on his own team. I understand that he's not super-motivated and that he doesn't have friends on the team yet, but the primary issue is that the team is getting run-ruled every game. That is no fun. And that is on the coaches, not him. Travel is no longer for just for the can't-miss D1 studs. There are plenty of tournaments filled with teams comprised of players who will never play past HS Varsity, and in many cases not past JV.
In your situation I think I'd talk to some of the other disgruntled parents and try to unite to tell the coaches to play a more reasonable schedule. If they refuse, walk, and get a couple of the dads to put together a new team focused on learning the skills necessary to play in HS and having some fun.