I don't understand this article's(2015) graph extrapolations going back downwards on gains that are certainly not going away in future processors iterations. C

I don't understand this article's(2015) graph extrapolations going back downwards on gains that are certainly not going away in future processors iterations. Clearly some curves have kind of flat lined but aside from the power consumption one which could logically go down and definitely has in terms of power/transistor ratio, the other ones are not going down any time soon for sure like the graphs suggest.