It has long been the development of artificial intelligence. We've all seen the movie "Terminator" and we know where it may lead. On the other hand for a person is very attractive to shift all the work to robots. You for which option?
Tell me, where it may lead? Machine has very precise thinking with very little space for "abstraction", feelings etc. Ive read fiction where AI absolutely logically assumed, that commandment "you shall prevent human harm" actually means "gas everybody and save them the pain of living in rotting flesh".
Giving power over your life and death to a tool you have no means of controlling is worth a Darwins price.
And no, not all work is going to go to robots. Look how the west turned NGOs (pretty much modern day church) and state apparatus into armies ever increasing taxation in the process. We already have robots doing most of the work. At no point in history did so few people - engineers, scientists, technicians and doctors, feed so many others. With assistance of robots.
You really believe that situation, where most of the population is expendable will lead to something good?
With all seeing AI none the less...