Billionaires are no longer a thing. There are significal social changes, where people realize they are responsible for each other, people no longer hoard wealth, or wage war. Everyone can marry whoever they want, Africa is no longer colonized, and people have access to all their basic needs. We could keep to the 1.5° temperature rise as stated in the Paris agreement, and pharmaceutical companies finally cure cancer with the medication they were keeping from us this whole time. Men and women are equal and there are no child brides. We started castrating pedophiles years ago and people with such tendencies ask for psychiatric help before they could even commit a single crime.