My stats are desktop graphic card market share.
Main word is Discrete. Again, you are not understanding that graph. Let me illustrate:
If any of following is sold, it counts as "shipped discrete graphic card"
http://pcpartpicker.com/products/video-card/#sort=a8&page=1&X=0,5153
If any of following is sold, it does NOT count as "shipped discrete graphic card"
http://pcpartpicker.com/products/cpu/#sort=d7&s=22,20,21,25,29&X=9503,341046
For gaming, any of those APU's are miles better than any of Nvidia's low end cards. Remember also that low end cards sell much more than high end cards.
So basically: when AMD releases high performing APU (coming August?), AMD's share of graphic card market AND share of so called "gamer capable GPU's" gets higher BUT discrete graphic card share gets lower.