Yeah but there are games that are never released on PC. It would be great to just have Sony, Microsoft and Nintendo release all their games on a single platform, it would mean I'd have a few less consoles under my TV.
I feel like at some point in the future since Xbox One is based on Windows 10 and Microsoft has said Windows 10 is the final version of Windows (like OS X on Macs) the two will merge at some point, maybe an Xbox SKU of Windows 10 like how we have Home and Pro now.