Since the split between Nvidia and AMD is more like 2 to 1, rather than 50-50, don't expect PC game developers to shoot themselves in the foot against the majority of PC gamers.
Also, as we have seen recently with the Never Settle games, just because a game developer has an AMD relationship, doesn't necessarily mean that the game runs better on AMD cards. Far Cry 2, Crysis 3, and Bioshock Infinite are good examples.
Another issue to consider is that the hardware AMD is supplying for consoles is not the same as the video cards that we have in our PC's. In fact it's quite different. Developing games for the PC requires adoption for a different type of hardware which will negate many of the console-specific optimizations.
Finally, there might even be some concern that AMDs focus on consoles may actually divert attention and resources away from their PC gaming development efforts. There is a reason Nvidia allowed AMD to have both consoles, and Nvidia recently made a point to promote its dedication to PC gaming. Hopefully, AMD will also be able to maintain a strong focus on the PC while devoting so much of its resources towards the console.