I'm not inclined to think so, though. I mean, the fourth book was a whopping 734 pages long - not a task that would likely be carried through on the whim of a trend. Not with the intensity that they do today. But if the children of today have been as emotionally invested as I believe many of them been, they'll probably read the books to their children, who will in turn embrace them, and so on and so forth. True affection by many for a book makes for endurance.
Endurance builds a classic.
I think Harry Potter is as likely a candidate for the title as any.