Wasting Away In Potteritaville?

In case any of you were hanging in the cave with Osama, this past weekend marked the release of the sixth in JK Rowling's Harry Potter series, "Harry Potter and the Half-Blood Prince". Rowling has stated repeatedly that the series will end with no. 7, which presumably she is working on as we speak.

Does anyone think she'd continue after seven volumes? After all, the series has been a license to print money. Or is it possible that the very success of the series will make it easier for her to move on? After all, it's easy to do what you want to do when you could probably buy Scotland with the money in your checking account. I think the bigger question than how the Potter series will end is how will her next creative venture be received.