If you think about it. Most households probably have 1 PC. But every person in the household will probably endup with a smartphone. Which really would skew the portable to PC device ratio.
As for me. It's nice to be able to check my email on my Android, but if I want to surf the net, I still prefer to do it on a full size screen with my PC. I can get buy on a 4.3" smartphone screen, but its not my preference.