When you refer to capital owners, it has a historic context related to land and farms and large amounts of money. Robots, on the other hand, aren't necessarily going to cost lots of money. If everybody can own a robot, nobody has to worry about being employed.

The real issues won't change though. Those people who are considered rich will be rich because they own land in nice areas, or have a military-backed monopoly on natural resources.

The first issue is due to population size, and the second issue is an eternal issue of war that can't be avoided.