Will there come a time when robots will be doing most of the building in our society? In a way they already do, but not in direct interaction with the people wanting stuff built: The factories that build our consumer goods are automated to a large degree, simply because the current state of technology is not easily doable by human hands. Even I, although certainly capable of soldering normal through hole components, shy away from surface mounted devices, simply because they are so small as to be barely perceptible!
But things are going to change: the things elon_musk has achieved in recent decades have accelerated the evolution of technology. And it is not just the achievements of his companies, but also the healthy competition from some other companies. The upcoming Department Of Government Efficiency will make it easier for companies to do things right, and the optimization of the laws that will be left will make sure it becomes harder for corrupt individuals to flourish.