This is really a dumb discussion. As folks have pointed out newer neighborhoods
are getting underground service and they are not going to dig up old
neighborhoods to do it. To start with utility maps are bad enough that they
would be digging up something else about once a mile and there are simply so
many things in existing right of ways that they are usually scared to dig even
if they know where things are.
Pretty much all of the underground stuff here is directional bored and that
ain't cheap.