People don't need to do much work to survive. They choose to because they want to play the rat-race. They want to compete with each other for status and wealth. And that's a good thing - it's what drives all the productivity that enables easy-goers to live off grid or in a tent or renting in a cheap neighborhood doing just a little part-time work.
Misleading graph alert! The green graph's vertical axis starts at 150,000 instead of 0. It shows the number falling to about 50%, not 10% as it appear at first. The misleadingness fits the author's narrative, which is how it always seems to go so I think it's safe to assume malice and that he's trying to mislead his readers.