What, me worry?
I've owned a Mac of one kind of another since 1987 and have never owned a PC, but my job involves the support and use of hundreds of PC's (75% Win2000, the rest XP) in a Radiology department. So I work with PC's and appreciate the relative advantages and disadvantages.
However, we are tied into Microsoft products, no getting around that. If we get into situations where they are not being patched/unsupported or whatever by Microsoft, my job is going to be hell.
I just have a hard time believing even Microsoft would go down this path.