It'll be a renewed form of serfdom, but there won't actually be anything for the serfs to do. I hope the powers that be come up with some nifty ideas to keep us content. Profit don't count for much if you're being raped to death by the masses you've raped yourself.
Remember that the birth rate has been falling in the western world, which means the working age population will start to fall too. So as the bots take over, the number of people of working age needing jobs will also be falling, which means the number of unemployed won't rise.
Look at Japan. The average age there passed 43 in 1990- within 10 years the working age population (people aged 16-65) started falling and now the overall population is dropping. Unemployment has remained low as a result even as growth slowed and they started using more robots.