Well I see how some people even after 20 years still have hope of finding someone alive but the thing is, they shouldn't have hope. If people would be able to just move on when the case goes cold it would be much easier for everyone in this world. Especially in such circumstances as kidnapping it is almost impossible to trace back the crime that is few days old, so such 20 year old cases got no chance of getting solved no matter how good our technology is.