I think Microsoft vastly overestimates the perception of the term "PC".
In their latest commercial, Microsoft snarkily has Siri saying "Wow, you're a real PC" to the competing Windows tablet. I suspect most of the general public would associate the term "PC" with complication and frustratio...
Answer these three simple questions:
Ben Franklin. Thomas Edison. Henry Ford. Steve Jobs.
The Mt. Rushmore of American Innovation.