Nowadays DS people are more fully mainstreamed into the general population and can lead productive lives. That is what eventually happened with Daniel.
You can read all about the Miller scandal here.
Daniel is doing well despite having an ass for a father:
Today, Daniel Miller lives with the elderly couple who have long taken care of him, in a sprawling addition to their home that was built especially for him. He continues to receive daily visits from a state social worker, whom he's known for years. Although his father left him enough money to provide for everything he needs, Daniel has kept his job, which he loves and "is very proud of," according to Rebecca, who visits him with her family on holidays and during the summers. "Danny is very much part of our family," she said, and "leads a very active, happy life, surrounded by people who love him."
Some wonder why Arthur Miller, with all his wealth, waited until death to share it with his son. Had he done so sooner, Daniel could have afforded private care and a good education. But those who know Daniel say that this is not how he would feel. "He doesn't have a bitter bone in his body," says Bowen. The important part of the story, she says, is that Danny transcended his father's failures: "He's made a life for himself; he is deeply valued and very, very loved. What a loss for Arthur Miller that he couldn't see how extraordinary his son is." It was a loss that Arthur Miller may have understood better than he let on. "A character," he wrote in Timebends, "is defined by the kinds of challenges he cannot walk away from. And by those he has walked away from that cause him remorse."
Arthur Miller's reputation as a great playwright will remain intact, but Daniel Miller is and will always be a far better person than his dad ever was.
