Define "Mobile Devices". My Macbook Air is an early 2015 model and it is over half as strong as the X1 (While using 15w). I wouldn't be surprised if the early 2017 model was nearly as strong as a PS4.
However, I do not think 2017's 2w devices will be as strong as 100w GPU's are now lol
Prediction for console Lifetime sales:
Wii:100-120 million, PS3:80-110 million, 360:70-100 million
[Prediction Made 11/5/2009]
3DS: 65m, PSV: 22m, Wii U: 18-22m, PS4: 80-120m, X1: 35-55m
I gauruntee the PS5 comes out after only 5-6 years after the launch of the PS4.
[Prediction Made 6/18/2014]