The population is going to stabilize somewhere between 9 and 11 billion by around the end of the century, and then start slowly declining. But getting back to 1

The population is going to stabilize somewhere between 9 and 11 billion by around the end of the century, and then start slowly declining. But getting back to 1960s level of population isn't realistic. Maybe several centuries from now. But at that point, we could reasonably expect advanced nanotech, advanced efficient automation, arcologies and fusion to offer sustainably high standards of living for 10+ billion people. It's really more of a matter of how we make it through the next 100 years.