HP Clue

After reading an interview Jo did in 2000, right before book 5, I have come to the conclusion that in book seven the DADA teacher will be a woman. Where do I get this?

Q: Is there ever going to be female Defense Against The Dark Arts teacher?
A: Emily, I can exclusively reveal (because I'm feeling guilty I'm not answering so many good questions) that there WILL be.

If she says there will be a woman teacher and we are now up to book seven without having a woman teacher, then obviously if she goes through with having a woman teacher it will be in book seven. Which brings me to another point. "I'm not coming back even if it does reopen," said Harry. At the end of book 6 Harry is determined to begin his journey of finding and destroying Voldemort. Ofcourse his friends said they would be joining him on this journey. So if Harry doesn't go back to school how would we know if the new teacher is a woman? Through Ginny? One of their other friends who goes back to school? Or will the school reopen? Do the parents feel safe sending their kids off to school now if it does reopen? Oh so many more questions I have that can not be answered for another 2 or 3 years. Too long. But I will survive. I did for the last one. Anyways what do you think?