I doubt that going to art school is any guarantee of success. I suspect that many who go to art school end up in different professions.
There were times I thought I would have liked to have gone on to a Masters and PhD in Art History or Literature... but then I look at the crap that goes on in academia that in some ways is worse than what we face as teachers in grade school. Honestly, I think that if I had it to do over I'd skip Art School and study at a private atelier where the emphasis is on mastery of traditional skills and not a lot of contemporary Art Theory and Criticism. Many of these ateliers expose students to the reality of being a working artist... including not merely how to begin and complete a painting, but also the business aspects.