That's because people nowadays are working in jobs with pretty poor union support compared to the manufacturing jobs of the past so there's not much competition

That's because people nowadays are working in jobs with pretty poor union support compared to the manufacturing jobs of the past so there's not much competition involved when raising salaries. As for the global trends, nothing points at job displacement until now, everything until now points to the pie getting larger, the opposite of your statement. I doubt you could fit the needs of any country on earth with just its local workforce nowadays anyways, even China itself can't. It's been a dozen technological revolutions and none of that happened already so I don't see why the next one would. Black swan events can always happen of course but I would not bet on it.