Just an opinion…whereas All State may not be the best indicator for acceptance into a competitive BM program, it may be fine for a BA or even a BM at a mid-level program. And there is nothing wrong with a mid-level program if you can find a good match with the teacher. They can help you grow. You may not have the fish bowl effect of competitive, high-level peers and this could certainly impact progress in ensemble type of work. Still a great match in a teacher should allow the kid to grow. Again I’m assuming the kid is not working solely on a performance degree…but wanting to continue lessons and keeping options open for the future.
And…as said above…there is always the possibility of doing lessons with a private teacher as well if the university is a great match but doesn’t have the right teacher. However it would be nice to get a “package deal”. Calling music depts at schools of interest may be the way to go to get the information you need. And you could ask some of the audition BA programs…do you think a kid who makes All-State would be competitive? You may find out Yes or Maybe or that’s not a good indicator. Music admission depts can be helpful most of the time. They know this is an expensive process…so asking for some “down and dirty” information is fine…and you can see how they respond…helpful or not.