Maybe I'm crazy too, but some year ago I made the same conclusion as the guys in the video.
Numbers are lower, about 1/3 since the incomes/wages and the living style in my country are very different from US, but in the end it's the same.
I have my own house which have a good value, a relatively good amount of money saved, all the retirement money I never touched.
When I understood my standard of living can be lower and the quality of life in the country where I live is relatively high (food, weather, hospitals, etc) , I began to think most of the things I have (big TVs, consoles, clenaning robots, a new car, an expensive pc, equipment, netflix, gym, restaurants, etc) are not essential, I feel they are not essential and I don't need this things, I can live with lower standards, I can eat less and healthier, with almost half of the money I earn today. I would have money to buy food, some clothes, buy medicines, fuel, buy a smaller house, all this thing with a minimum pension and all the money saved.
Maybe there is something I'm not taking into account, but it is pretty much this.
Yes, I'm crazy and I have had enough, but this is not about money, it's about to have courage to change your life.