​I disagree with some of your opinions and agree with some of them. I disagree with your first reason that replacement to robots will decrease the overall level of happiness. A person may feel happy and relieve stress by working with others in a job. But there may be cases it is not. Furthermore if the works we have to do are reduced by using robots, we can spend much more time to feel happiness than before. But I completely agree with your opinion about economical problems. The replacement to robots inevitably leads to unemployment, and the resulting economic problems are one big drawback.