Oh, yes, they are!
However many savants are only brilliant in one area and are still socially clueless. But agree that they are really fascinating.
Safe to say my son, at least, is not a savant, but is high functioning and can live on his own and is learning more and more how to deal with this thing called "life." Nobody guesses he is on the spectrum, but he had A LOT of help. There is hope, but these kids need lots of structure and they don't like change. But sometimes that can not be helped and there is nothing we can do.