This is an excellent question. I think the major question mark hanging over this projection is the role that automation will play in the future. Both in terms of physical production, and in terms of white collar or office work. One could argue that economies which are best positioned to take advantage of automation might feel the impact of a declining workforce less, but then those same societies run the risk of high unemployment and low domestic economic demand for products and services. The balance is crucial and economies are generally slow to pivot.