This tiny 4 inch by 1 inch box can play 4k at 30fps, provide super fast internet browsing, Facebook, Youtube, Office apps, video conferencing and play Android 3D titles well. And it costs 64 Pounds or 90 USD! It geekbenches 1600/3500 which is pretty respectable compared to an Intel i3 which retails for around $150 just for the CPU. Why spend anything more for grandma's, mum's or a just a general PC. It also has good support for Kodi so no need for expensive HTPCs.
So here is a 60 GBP device doing a of lot of thing a traditional basic PC or laptop does at a fraction of the price, power, noise and size! This is disruptive.
The only thing holding it back is the absence of proper desktop support in Android and the relatively closed nature especially GPU of the Arm ecosystem. Also the PC ecosystem is accustomed to a much more open hardware and software playing field, and the driver scenario for ARM and Google's control of Android itself can be problematic.
Android is currently completely touch oriented and even though you can attach a keyboard and mouse, as the recent Ars review highlights [1] there are quite a few rough edges.
Remix OS is a step in that direction but it appears some of the issues are serious enough that only Google can address. A better situation is ARM being more open, Linux is already well supported on ARM so if it opens up the drivers in good faith without the back and forth of licensor and licensee that open source developers deal with, desktop need not depend just on Android.
[1] http://arstechnica.com/gadgets/2015/12/android-on-the-deskto...