Microsoft has one of the most diverse revenue streams of any software company. They're going to be around for a while.
Google should actually be more afraid of disruptive technologies. Their revenue is primarily from advertising. They are truly a single revenue source company.
http://www.businessinsider.com/chart-of-the-day-microsoft-op...
http://www.businessinsider.com/chart-of-the-day-in-case-you-...
Still, even if you ONLY look at Apple's software revenues, I suspect that Apple would turn out to be more diversified than Google. :)
Has it actually been determined that Microsoft makes any profit at all from any of those products? Entertainment division (where XBox and Live and Zune lives) is about 12% of their revenue and is still not profitable, while search and online (which is Bing and MSN) loses $700 Million every quarter or thereabouts (at least it did last fiscal quarter).
Their bread and butter has always been Windows and Office. That other stuff are loss leaders, in a way.