They are a little too big and Hot for small mobile devices.
Gaming Consoles are still pretty weak.
That battle has already been lost. Consoles have not only won, but won by a crushing margin. The best selling video game at the moment and all time, Modern Warfare 3 is a great example. PC and Wii sales combined make up 4% of sales. Xbox and Playstation make up the other 96%
And I don't think that you will see guys like me that do graphic art and HD video editing giving up our quad core PCs with 23 inch monitors anytime soon. Imagine a movie studio trying to edit a movie with an iPad.