We are living in a post-industrial service economy. Many jobs are not unnecessary, just routine and unglamorous.
You order fast food from a touch screen, you buy your train tickets from a machine and the supermarket cashier is being replaced with a self-checkout.
Meanwhile I still have about 50+ working hours every week. I pay about 65% of the money I make in tax so the people that were laid off through service automation can receive unemployment benefits.
I think there is room for improvement within this economic system.