Ags1 :
Why would AMd kill FX? They have a modular arch so it should not take much investment to scale up to four modules even if two modules are the focus. FX may cater to a niche but it is a much bigger niche than, say, the Nvidia Titan niche. If Intel push up their prices it opens the market to AMD.
Because:
1) Only a small percentage of people is interested. I think only about a 0.36% of gamers has a octo-core FX. Moreover, the modular approach does not eliminate the money that AMD would pay to fabs for a low-volume product.
2) The goal of an octo-core FX CPU would be parallel workloads. However, the GPU is much better at parallel workloads than the CPU. Therefore, AMD is substituting one half of the CPU cores by an iGPU. Example? Substitution of octo-core Opteron CPUs by quad-core Berlin APUs.
3) An octo-core FX CPU lacks hUMA.
4) AMD want to maintain and develop a single platform, instead sharing resources between two: FM2-like and AM3-like.
5) APUs have better press than FX-line.