[BlargMcLarg]

You don't need growth in zero-sum areas or areas that would make us face environmental collapse for people to want to survive and see their needs met.

Perishable goods still exist. People will still work to create perishable goods to consume. They will still change cultures and create solutions in areas where the game is not (pseudo-)zero-sum.

You also can't grow everything forever, as real estate is showing. If your concern is people stealing, that's an obvious target.