I agree that the special ed as currently done is a problem. For many, if not most, of those kids, mainstreaming doesn't help them learn better, probably doesn't even make them "feel" better and hurts the kids who are not special needs. Honest educators will tell you this, but most won't say it publicly. However, I still don't think it's the "biggest" problem. The BIGGEST problem is the teacher's unions and the second biggest is the schools of education that are a mess.