OK, so from an interview article on MSNBC comes this quote. J. K. Rowling is talking about how she originally had a far more detailed epilogue than was finally published:
“But it didn’t work very well as a piece of writing,” Rowling said. “It felt very much that I had crowbarred in every bit of information I could … In a novel you have to resist the urge to tell everything.”
I just post here to note that the way Tolkien handled this was by creating annexes and appendices and language guides and timelines and family trees and things. I think that would have been better than the epilogue, which has been derided as fanservice by young and old alike.