It is sad the family had to go through that, not only the death of their daughter but the years of public scrutiny. It would be remarkable if they could still get the guy, but they will have to do it with 1/1000th of the evidence of the OJ case.
The odds are that at some point in the future, the killer will be in police custody and his DNA will match what they found. Few people commit such a crime just once in their lives.
Only question I have is did anyone like a laundry operator touch the child’s clothing? Maid? Someone who wasn’t the killer.