> The diversity of *nix based OSes are a testament to what could happen in the absence of monopolistic powers.
You mean how they all died and Linux became king?
The market cannot support diversity of operating systems -- users will flock to where the applications are and developers flock to where the users are. Only a small number of choices are ever sustainable.
If Android disappeared tomorrow and 10 operating systems were designed to replace it eventually there would be only 1 or 2 surviving.
If Samsung forked Android it will still need to run Android apps and therefore be Android. That's pretty much exactly what they do now.