Unmanned Robots in Society

I don't think that this is a good idea. First, robots would be created to perform the jobs of individuals. Second, this decrease in the number of jobs would lead to a gradual decline in the economy. Third, once most things are automated, there would be no reason for humans to exist at all, except for the human who were left to design the robots. But, this too could become a problem. Once we create robots, who's not to say that the robots could somehow find a way to reproduce, evolve, and take over the small population of humans left on the planet. The only reason I see to have robots is to fill new niches in technology where human labor did not exist before and to control the abilities of the new robots. They should only be used for specialized labor tasks.

I know this sounds like a doomsday scenario, but hey, I think anything is possible.