Android is becoming more and more locked down like iOS. Even if it weren't, it's still always been more locked down than a standard desktop or laptop machine running an operating system of the user's choice.
With the advent of smartphones and tablets, already I see non- and semi-technical users often dropping their laptop or desktop and just using their phone or tablet. (I know people who don't even have a laptop/desktop anymore.)
Android having a full desktop interface will just add fuel to this fire, and further normalize running a locked-down OS and device that users don't truly own or control as their only computing platform.