He thought it would be fun if it was just him and a few friends left to do as they pleased, with everything at their disposal. He felt that it was a grim daydream and that Empty World was an exploration of that daydream.
He envisioned a scenario where he and a small group of companions were left to their own devices, having complete freedom and access to everything they desired. He considered this a bleak fantasy and believed "Empty World" was an exploration of that fantasy.