What's the harm? By the end of the century robots will be doing most of the work anyway. People can concentrate on the things that matter to them instead.
Who's going to build and service the robots? Who's going to build the chips necessary to build the robots? Who's going to operate the ships required to move the parts to the destination to be assembled? Who's going to build the ships? Who's going to to secure the shipping lanes? Who's going to grow and process the food? We don't have the parts that we need now to build new cars and tractors. Can we really afford to b…
How many people would you need, in order to build robots? Not many, and most of it'll be automated anyways. And remember the birth rate is not 0.0 it's 0.8. So I think fewer people will be there because we don't need more people. Society will change to accommodate to low birth rates.