Is the OS Relevant Anymore?

I just read a post from @absenth referencing an article in Linux Journal about the relevancy of the OS.  The crux of the article is that, due to the transition to Cloud Computing and Software as a Service, the host OS is becoming less important.  Users are less concerned over the version of Windows or MacOS that the system is running, and more concerned with finding a good web browser and an office suite.  This trend is most visible in the netbook arena where most offerings include a stripped down version of Linux at a reduced price.  

So is the OS relevant?  If you were presented with a new laptop, and you had your choice of running Windows, MacOS, or Linux, would you have a preference?  How much would you pay for your preference?  I don't have any hard evidence, but I suspect that the average person would pick Windows if price were not a factor.  That would be my choice.  It would also be my choice when choosing an OS for a family member or non-technical friend.  I know my family members are familiar with Windows, and familiarity means fewer calls to me for tech support. That's worth at least $30-$60 from me.  On the other hand, I would choose the Linux variant for myself if it meant saving $100.  

I like the trend towards cloud computing, and I think it can only mean good things for consumers as the OS and hardware become less important.