From the point of view of learning, and while I don't necessarily see them as equivalents of these examples, I can see the
Harry Potter series being considered a classic (and used for teaching) in the same way as
Lord of the Rings and the
Narnia Chronicles. I particularly see the possibility of it being used as introduction to "literature" matters like themes, character, plot, for folks just starting on that path in early high school.
And to see the crossroad where Stephen King and
Harry Potter meet, for those who haven't yet:
http://www.ew.com/ew/article/0,,2043...050689,00.html
(WARNING: Contains nuts...and probably spoilers)
Cheers,
Marc