What Blackberry Should have done!!

I haven't used the new blackberry just yet but I don't understand why they spend so much time and money developing a new OS. What they should do is just utilize android as an Os and develop a custom interface like touchwiz/sense. They could essentially bring true push email to all android handsets and still license their blackberry servers to corporations. To me this seems logical considering they are already emulating android apps within their new OS.

Just a thought!!