The use of smartphones and tablets are increasing very fast. The adoption rate of smartphones from dumbphones is really great and due to android OS now everyone can able to own a smartphone. Currently only 10% global internet traffic driven by mobile and according to Cisco it is going to quadruple until the 2015. So the user base of mobile internet users are increasing rapidly so mobile marketing is going to become one of the important factor of overall marketing strategy.
In U.S, Mobile payment has outnumbered other mode of payments which clearly tells us that mobiles are still growing and smartphones are especially sorted most by young adults and business professionals who are more in number.
it will take some time before mobile marketing will be able to compete with pc and laptop market. Currently laptops and pc's have more numbers. Also the results in small screen seems awkward to me.