The trends towards usage of a Smart Mobile device (as opposed to a pure phone and as also opposed to a dumb mobile device) is increasing. However be careful with the hype.
The issue is that the metric is a very broad one. Accessed a mobile search once a year.
However I do believe that the adoption curve will be fast and furious as people get used to using Smart Mobile devices.
If you want to have a little quiet giggle to your self. Next time you fly on a plane with a seat back video system. Watch how people interact with it. Those who have smart mobile devices will use gestures and will swipe a button on the touch screen. Those who dont will be trying to disturb the people in front of them