I dunno dude, just my opinion but the mobile thing, at least with the devices we are offered at this point is a buildup to a much larger 'thing' -- but not for quite some time.
Myself I cannot see having just a mobile device, I don't want to type on a screen or find a place or a way to hold some fragile slice of overpriced tech. I'm not bashing them , just saying personally I can't see restricting myself to something like that.
Hell I'm always waiting to get a larger screen , another screen, a faster proc w/ more memory to handle the several applications (no - not apps lol I still have enough energy to finish the word )
Yes if all you do is email youtube pinrest or of the likes then I can see it.
At the same time with this fad all I see is a nation / planet filling up with end users instead of people getting more interested in developing and furthering their imagination, by expressing it through code, which is what all these things use to display a pretty image of a donkey with a chimp huggin it , or better yet , a nice looking female with a birdy hanging out on her well endowed chest -- yup I said it
Anyhow from my viewpoint, I'm 43 and been playin around inside machines since before we had that thing called the internet, I find myself delving deeper as time goes, always playing catchup, learning new ways to do things I've used for years but never gotten into enough to actually develop.
Just saying, try not to look down , try and look forward. Always learn something new, I believe that and quite possibly that alone is what keeps the mind in shape. That excitement of something new to add , the frustration of not knowing what to do next to achieve your minds projection and bring it to fruition . And finally implementing your creation, and all the time moving forward with the next ongoing dilemma you've conjured up mentally.
I've been repeating this for years in a jocular manner , but years ago sitting with an elderly man ( which can be very much more rewarding in so many ways it's almost impossible to describe, getting the thoughts out of wisdom) thoughts are tools to be used for advancement, anyhow , the man said to me funny enough , you know how to stay alive ? He said , no , really , alive and well ? Keep your woman working , keep her mind moving and yours as well , otherwise the woman goes off the deep end and gets lost within her and your own box. And you'll soon join her there. Wherever that is.
Mental Vision - keep it !