I think most child abductions have been covered adequately by stations local to the crime. But you're right, for some reason these crimes are starting to get national attention. Why?
Because of the criticism the media has gotten for not covering all of them. How many times have you seen. "They only report the rich white kids, not the black or hispanic children." Have seen it right here about the little black girl who was kidnapped a month before Elizabeth Smart.
They are now trying to cover them all and prove there is no favoritism. It can't be done. Guess we will need a missing childrens network soon.