I personally think phones will become the 2nd screen desktop processing points.. A la ubuntu touch or the windows attempts. I travel a lot, and need to be productive in many places, having my desktop in my mobile is where I see that going.
If I could just drop my phone in a cradle on a desk, at home, at work, at all the locations I travel to.. If that cradle became standardized like USB (c) charge is.. I can live with 'less' of an OS 99% of the time.. I just need keyboard / mouse / 24 inch high res screen..
Mobile processing power is either there or close.. Its the OS not the hardware that needs to make that leap.