Digital media has really changed the landscape quite a bit, and books in general aren't as popular as they once were due to lots of new competition in media and entertainment that are so accessible at everyone's fingertips today. I would say that Harry Potter is the last book series to have the kind of impact that it did, but there are lot of others as you go further back.

A Tale of Two Cities is probably the most impactful book I can think of off hand, if we are talking about widespread popularity and staying-power.