We currently have two ecosystems - Apple and Amazon.
Apple started from the music/hardware interface, and expanded into phone and internet/media.
Amazon started from retail/sales and expanded into media/hardware.
Microsoft only has disparate pieces. It started from computer software/gaming, but hasn't been able to successfully expand into anything. Still...
If Microsoft can provide a worthwhile, seamless interface/interoperability among difference forms in the next couple years, (which I doubt, but I can't rule out), then you have a computer/gaming/phone/media/internet hardware platform with a software walled garden (B & N Nook store, expanded into music, games, video and apps as well as e-books). That could be monster that makes Apple look like a popgun...