Maybe he's trying to build up fresh reputation to gain trust for a new bitcoin project of fun and adventure!
Without paying everyone back? I don't think so.

Actually, in this world full of gullible people, it works exactly like this.
He would probably say he needs to do this new project to raise the money to repay everyone, people would follow, he would pay a few out to gain more trust, the when he has a few thousand invested, would run off again.