[Terrabon98]

this book was soooooo sick good. I loved it, and thought it wrapped everything up well.

I think the purpose of the epilogue, as others have mentioned, was both to give closure to the situation, and to ensure that others do not start their own spin-offs. But JK has definitely still left a lot of room for writing more if she ever gets the urge. Just b/c Voldemort never came back doesn't mean that they could not have run into other crazy/interesting adventures in the 19 years that elapse...