Could a Harry Potter 8 work?

Considering how the Harry Potter series ended, could a Part 8 work? I mean no one thought that there would be a Star Wars Episode 7 much less that The Force Awakens would ever be made but it has and with Harry Potter the Harry Potter series if they were to come out with a Part 8 an eighth book of course would have to be made now wouldn't it? I don't think J.K. Rowling would go there unless fans really wanted it but even so I don't see how the series could continue unless they were to continue it with the next generation with Harry & Ginny's children and there ends up being a new villain to carry on the franchise since Lord Voldemort is dead