Apples Foxconn factory in China just fired 60,000 people and replaced them with robots.
So the fact that GDP in the US, for example, went up over the 20-year period in the elephant graph doesnt mean that wages went up, or that workers are better off. They did not, and they are not.
This is the hollowing out of the American middle class. This is the shift from labor to capital. And this, I believe, is the source of a significant amount of global discontent: where phenomena like Brexit and Sanders and Trump find fertile ground.
Technology has gotten so cheap that it is now more economically viable to buy robots than it is to pay people $5 a day.
I don't believe that chart is an indicator of future performance which could be higher still, or lower. Just my own humble opinion.