If they do get the 40% higher IPC for ZEN, and keep the high clock rates of the bulldozer/piledriver/excavator chips, I can see them being pretty much level with Intel. If they can also keep their lower prices, it will be an easy choice for a CPU for a gaming rig.
Once again, that's a big if, 40% is huge.
PS, PS2, Gameboy Advance, PS3, PSP, PS4, Xbox One