Doctors and teachers and therapists, they can be a great many things, but they're generally not very skilled prognosticators. To be fair, I don't think very many of them actually claim to be able to tell the future, and I imagine most of them don't even want to try. As parents of kids with disabilities, we ask them to. We demand that they try. Our world and that of our children is already far too full of uncertainty. As a result, we ask for information that our kids' caretakers and educators can't possibly possess. So I recognize that we really do sort of have it coming.
But God help me, I do so love it when they're wrong.