There have been multiple instances when the same grand declarations have been made and Microsoft has only survived and remain dominant.This is just the next cycle of competition.
Microsoft is paranoid enough and this article makes the assumption that they have blinders on and while the move to web etc is happening people at Microsoft are twiddling their thumbs and will say please come and take our business away. Maybe they are in a good position to take advantage of these new paradigms. Of course there is a fight out there but declaring death is premature, significantly challenged, yes.