While the trend report from Mary Meeker, partner at Kleiner Perkins Caufield & Byers, suggests that by 2020 half of all Web searches will be made through voice and image search, I believe that percentage will rise much higher -- about 65%. The percentage of U.S. smartphone owners already using voice assistants in 2015 already reached 65% in 2015, up from 56% in 2014, and 30% in 2013, according to the data.

The technology behind Alexa, the voice inside Amazon's Echo speaker, could become Amazon's fourth business pillar, alongside retail marketplace, Amazon Prime and Amazon Web Services. Here's why.