From: Google Apps Support
Q: My domain is already registered
A: Did you recently delete your domain? It takes seven days for a deleted domain to leave our system. You'll be able to sign up again once seven days have passed.
This is relevant because, having hypothetically deleted your last account, you'll be without service for seven days.
In short, you hold the power with your domain. It is completely possible to do this, but you'll just have to wait for seven days after you make the jump. .
