So, why is any of this worth arguing over?
First, it's unconfirmed. As others stated, getting hyped over a slide without any basis in reality is just a waste of energy.
Second, why is any of this unreasonable? What is being announced is functionally a Phenom III. People said this when Bulldozer came out. I remember asking why AMD didn't immediately jump ship, die shrink the Phenom II, and consider Bulldozer as the equivalent of Pentium 4 (great on paper, poo in reality, gotta spread that Netburst hate). The better part of a decade later, and they announce exactly that. I'm not seeing why any of this is ground breaking.
Next, AMD and Nvidea share ownership of the patents that make most GPUs possible. They exist as such because video cards wars are stupid. Think back to the 90's, where each GPU would perform differently in games because they were few standards. AMD and Nvidea got together, and agreed to licensing of patents so their products had a market, rather than trying to split the existing market based upon hardware. It makes sense, if you release the next hot piece of hardware, and want everyone to be able to buy it and upgrade. This is why the Intel GPU generally blows. It isn't bad, but they have to find ways around existing patents. Sometime a simple job can become impossible, when the proper tools are denied to you.
The consumer market sucks. CPU manufacturers don't bend to it, because selling a tray of CPUs earns more money than selling a dozen individual ones. AMD, in the business setting, is a joke. They are more problematic in data centers, because of heat and a need for raw performance. Even if AMD released an excellent CPU that undercut Intel on the consumer side, their adoption into servers wouldn't happen for years. They cut their nose of with Opteron running like bulldozer, and coming back from that will take much more than one decent CPU release.
Why does AMD even care about the CPU side? They no longer have their own foundries. This puts them at a disadvantage when compared to Intel. Competing against Intel has also yielded poor results, because AMD doesn't have the budget to compete with Intel, Nvidea, and ARM all at once. The APU is decent, but ARM is a strong bit of competition. Nvidea provides more than enough competition in the GPU market. How can AMD do anything but compete against Intel with value? Right now Piledriver may be cheaper than Haswell, but it's performance isn't up to the standards consumers expect. 70% of the performance, for 80% of the price isn't a deal, and that's what AMD has got. Even if tomorrow they released a chip with 80% of the performance at 80% of the cost people wouldn't adopt it in the business world.
I'm hoping that Zen puts AMD into competition with Intel in the consumer market. I'm also hoping that the server implementation is good enough to draw business partners back to AMD. Despite these hopes, I think AMD should be focusing efforts on the APU and GPU. Those battles can be won, and the Zen architecture may well make a very mean little APU. Dividing their resources up for three battles just isn't a solid strategy.