Making a prediction here:
Android (and distros based on it) will make GNU/Linux distros obsolete on end consumer dekstops.
* Android dekstop mode is getting good: https://www.youtube.com/watch?v=yzDO-GS-Bm8
* Android is a more attractive, single platform for developers to target
* Better security model than GNU/Linux
* Users will benefit from familiarity and integration with their phones
So eventually, distros based on android will eat ubuntu/fedora etc.'s lunch