There are so many stories, too, of teachers who tried to make a difference by trying something new. And it threatened the system and they make live hard for these special teachers. They often end up leaving teaching forever.
Education, like any field, needs people who push the envelope.
The problem with mainstream education is simple. It's too one size fits all. How much training do you think that a mainstream teacher, even a sped teacher gets in how to teach dhh kids?
The thing is, they thought that mainstreaming would lead to high acheivement among dhh and other low incidence kids. It did intially, but that's b/c the First Wave of mainstreamed kids had the advantage of disabilty specific education training. It is TOO easy for kids to fall through the cracks..........and not just with reading and writing....incidental learning and social emotional development is very often forgotten about too.