2: People buy PCs to use them TODAY. And for Todays Games 2014-2015 FX83xx @ 4.4GHz + 290 is better than Core i5 + 280.
This is a silly comparison. FX-83xx @ 4.4GHz with a suitable motherboard costs the same as a locked i5 with a suitable motherboard, yet you pair the i5 with a $70 cheaper graphics card.
3: If the user will keep the system for 4-5 years (2015 to 2020) then DX-12 will make the FX83xx @ 4.4GHz more than enough for R300/GM200
4: New games always increase Image Quality making them even more GPU limited than todays games.
Another silly argument. FX-83xx is already showing its lack of performance in current games, as per RussianSensation's lengthy charts. In your words, people buy PC's to use them
today, so what does it matter if in a few years time games will be DX12 based or be more GPU limited?
Also, you can't count on DX12 making every game easy to run with any old CPU. It can open up doors to developers to do stuff with the newly available CPU potential that they couldn't do before.
1: People recommend the H81(only PCIe Gen 2) + entry level non OC Core i5 that has less features (no M.2, no SLI/CF, less SATA-6 etc etc) than AMD 970 motherboards.
FX-83xx is
more entry level than a locked i5. Be honest with your terminology.
M.2, SLI/CF, SATA-6 etc. are secondary features that don't impact games the same way CPU performance per thread does. Not only that, but SLI/CF with an AMD CPU is a bit pointless - if you're prepared to pay for two high end graphics cards, then you should be prepared to pay for an Intel SLI/CF platform as well, otherwise you're just creating imbalance.
2: PCIe Gen-2 has more than enough bandwidth even for next gen GPUs.
Only for single GPUs. With dual GPUs, you can get considerably more framerate dips. Sure, it'll still be playable with PCIe 2.0, but nowhere near "more than enough bandwidth".
4: You can OC the FX8320 @ 4.4GHz with default Cooler if you turn off Turbo and under-volt.
Or you can get an i5 with performance per thread better than FX-8320 @ 5GHz. Any marginal difference in initial cost will be countered by the difference in power consumption.