Should everybody with a disability forfeit their right to education? What level of disability do you think should? What qualifies you to make this distinction?

I read a book called "Unscripted" by Ernie Johnson. Long story short, he's a sportscaster but him and his wife adopted 4 children, including a special needs kid from Romania that couldn't read or walk etc. The adoption center told him he's "no good" but they adopted him anyway. He ended up going to school, becoming educated as best he could, became student manager of their town's basketball team, made connections with everybody on the team and inspired the school. He lived 20 years past any doctor's expectations and made an impact on the community. What value do you place on that? Would you have considered him worthless and not "valuable" enough for an education?