[programminggeek]

Because there are too many people and people need to feed themselves and their families.

For example, consider if your job was made obsolete in 20-30 years. That there was no longer a need to program or manage computers any longer. All of a sudden all of this knowledge in your head is now basically useless and you have not likely developed any other meaningful skillset.

What do you do and what does society do for you?

THAT is why eliminating jobs is a problem. At some point the jobs simply aren't replaced by other things, or the other things are menial tasks, not meaningful tasks. If you eliminate enough jobs there isn't enough money to keep the consumer based economy afloat, and then the companies that own the robots go out of business because people who buy their products no longer have jobs or money to afford their product.

There are no clear solutions to this problem either.