Why should there be a limit? If you can command robots to build anything you can ever imagine, who doesn't want his own Versailles - with impressive towers like the Burj Khalifa? Who doesn't want to fly their jet or space rocket just for fun to the moon and back?
And humans will be humans. There will be new games, like drone wars on distant planets, where any production capacity and energy will be used. And since everything is very efficient, there will be no food left for birds or even poor humans.
And humans will be humans. There will be new games, like drone wars on distant planets, where any production capacity and energy will be used. And since everything is very efficient, there will be no food left for birds or even poor humans.