I didn't go to school and I don't intend to. The rest of my band did, but I'd argue that a few of their degrees will end up going completely unused. Living a decent life does not require a 4-8 year degree. At all. If he opts to not go to school to tour, who gives a shit? Maybe he'll be burnt out on touring in two years and go back to school then. And why question a parent on why they're proud of their kid? That's entirely up to them. He isn't doing anything wrong and he's enjoying himself.
I'd argue that there's far more to going to school than just getting a degree. Most of what I wrote agrees with most of this anyways. I have no clue on why or what made you want to join a band, but it's pretty clear that you're more than some kid who wants to get into a van and tour for the sake of it, you're a pretty damn good musician in a pretty good band that had the potential in getting big, and has the potential of getting bigger.
My main point was that tour is you wanna, but at least have a solid plan. Secondly, parents can be as proud as they want, but preachy internet attitude grates me.
Anyways, I feel like I said all that I wanted to, and that i'm afraid this is gonna escalate into me sounding like I'm shitting on this kid/getting into an argument.