You seem to be getting a lot of downvoting, which is unfortunate. So clearly your use of the word 'terminal' is nonsense. You have no way of knowing that, any more than you know that China's will continue to grow or any other bit of economic crystal ball gazing, but...

I am interested in your assertion about the actual numbers 1980s vs today. Can you provide a reference for that please? The direction of travel in those 40 years seems plausible to me. After all, China has definitely become a much bigger slice of the world's productivity pie than it was then so others must have a smaller ratio than they did. But the absolute numbers are kinda interesting.