Microsoft just had Steven Sinofsky, president of Microsoft's Windows and Windows Live operations, leave too.
Google seems stable, but Android is vicariously being sued through Samsung and HTC by Apple.
The iPhone 5 was unimpressive and Android is still clunky.
If BB10 is all it's made up to be, I think RIM has a great shot at coming back. It's not only technology but trends and fashion. There is more to this than simply which has a better UI/OS. Even if BB10 is amazing, they still have to become 'cool' again, and I think this is a perfect time for that to happen. They're at the bottom of the barrel and people always love great products from the underdogs. We'll see though...