[Opinions] I wouldn't bet on it (m)
The kind of fanaticism over a fantasy book or book series that Harry Potter has inspired is a once-in-a-generation phenomenon. The only other book/series to have inspired such a frenzy is The Lord of the Rings. Despite the amount of time that has passed since LotR was published, it's still as popular as ever - perhaps even more so.
I believe it will be at least 100 years before people no longer automatically associate Hermione with Harry Potter. I could be underestimating, though. The series will be very popular for a very long time.
♦ Chrisell ♦
All we have to decide is what to do with the time that is given us. - J.R.R. Tolkien.