The Yellow Pages have not gone anywhere
Think about how people used to find a plumber. They opened the Yellow Pages, looked at the first big ad, maybe the second, and rang it. Almost nobody worked their way down to the little one at the bottom of the page.
Google Maps is the same thing with a different cover. When somebody searches, Google shows three businesses on the map. Most people ring one of those three and never scroll. They only look further if all three have bad reviews.
The difference is that the Yellow Pages showed everyone in town the same page. Google shows a different page to every person, depending on where their phone is.

