I think competition is good because it drives innovation and makes things cheaper for us all in the end. Had Apple been a part of Microsoft, I doubt that the iCommodity market would have been as big as it is today. They are pushing Abobe Air, FLASH and countless other products, and it is up to Microsoft to ensure that Silverlight for example is as pervasive as flash.
A few years ago, there was just the iPhone. Today you have Android and WP7. You can argue about which one you like and choose the one you like, how does a company promote competing products well?
I am not scared of learning anything new, and hope that as I escalate in seniority, I can manage Java or Linux based systems. You cannot know it all, much like I don't think a company can do everything well, and Microsoft is already too big.