Mobile SEM vs Desktop SEM

There are 2 types of searches available, one through desktop and other from mobile. Desktop-based paid search are down to 34% from 38% of the total ad revenue if we compare it from last year This was down from 38 percent a year ago.
But overall in terms of dollars generated its more than 1 Billion generated from last year Mobile ad revenue was around 35 percent of the ad revenue which is around whopping 66% increase , a 66 percent increase from last year and it amounts to 43 percent was from paid search.
 The combined value of desktop and mobile paid searches was roughly $29.2 billion in 2015. Accordingly, it constitutes 49% of total digital ad revenue .
Nowadays people tend to search more from mobile then from desktop.

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Future of SEO

 In some years I can see that future of SEO is very bleak.
In future Optimization will not only be restricted to Personal Computers but also to mobiles.
You can say that Mobile SEO is said to be the future of Optimization
I'm saying this because there are many mobiles nowadays that have windows , android and have big screens,so most people will be gluing to there mobiles instead of their computers.
But there is a difference in that in today's optimization if the website is on 1st page that is in between 1st to 10th results then it will get traffic surely but in mobiles if the you have to do SEO in the way that your website will be in 1st 3 results.
Also there will be different tools on mobiles than PC so SEO will be difficult in mobiles than Computers.