That's rediculous. If a market with 0 profit opportunities exists them time is frozen and all future innovation is impossible. It means that every possible inefficiency of every single person working has been removed. Humans are never perfect beings, and usually far from it, so there is always opportunity for more efficiency. Also the goalpoint is constantly moving as more technology is created to replace older ideas.

If we ever reach a so called "optimal market" as you describe it then GDP growth will also stop, as will personal income growth and all manner of things..