I don't have a child with Asperger's, but my friend is familiar with Structured classrooms. She lives in a different area but they offer them there.
The way she describes it is that it is a very supportive environment for kids who have behavioral concerns that interfere with learning in a typical classroom. So they focus on how to manage emotions and behaviors that get in the way of learning, I believe with the goal to integrate the kids back into typical classrooms.
We don't have that at our school but we have a Learning Center for the kids who have behavioral/emotional challenges (so kids spend half the day there), and our Resource Center/Room is more for kids who struggle academically.
I would look into it - best thing you can probably do is just get as much information as you can and go with a list of questions. Arrange a meeting and speak to the people in the know.
It must be difficult navigating all this without truly understanding what he needs and what's offered out there. I would imagine changing schools would be hard, we've done it and our kids did adjust. If what they offer will make his experience more positive overall, it's just worth looking into. Good Luck :)