Do you have any data backing up the claim that a significant number of people connect their pcs to their televisions? Outside of the tech industry I imagine this is simply not a large consumer base.
Also, this has been an unusually long console hardware cycle resulting in there being a much bigger gap between PC and console graphics.
Is not about how many people connect their PCs to their televisions, but about how they enjoy playing their games. IMHO that does not justify the Microsoft exclusivity strategy.