The ROI for high end desktop CPU's is pretty damn low.
Ok but keep in mind that:
Currently it's too expensive to develop 2 specific CPU architectures: 1 for mobile and 1 for desktop markets. AMD's Fusion still uses Athlon II X4
desktop CPU architecture, while Sandy Bridge is used for Intel's laptop chips. What you need is a well-rounded architecture that performs well in both markets. Intel was able to do that. The problem is someone at the very top decided to go all out on cores for Bulldozer and neglected all other important aspects of this design decision: overall power consumption, IPC and performance/watt. The design decision of going with MOAR CORES while not putting any resources towards IPC pretty much bets the CPU on heavily multi-threaded software (we aren't there yet), OR on having a very high frequency ceiling that can overcome IPC deficit (but this often requires higher voltages and higher frequencies contribute to worse power consumption).
So the return on investment for desktop CPU architectural design overall is actually not that low.
Intel has outstanding gross profit margins.
It's pretty obvious you
can make a lot of $ selling desktop and laptop chips based on a robust CPU architecture (see Conroe in C2D, Nehalem/Lynnfiled in i3/i5/i7s, Sandy Bridge, etc.), Problem is AMD wasn't able to do it.
Especially when the cards are stacked so heavily in favor of intel, the main one being the cash on hand. It's utter stupidity to pursue it any further when they have a volume chip knocking on the door that will likely gain desktop share. And besides as we've seen across so many forums, nobody wants AMD's chips for the high end anyway.
Ya, that's probably true. I agree with you that in the long-term, a lot more consumers will be happy with decent performance at low price and low power consumption. But I think your 2nd comment about no one wanting AMD chips for high-end has more to do with AMD's lower performance, not necessarily with the AMD brand. If AMD produced a good desktop CPU, a lot of us would want such a processor for our systems
But ya, generally, I probably agree with you that in the short-term, it would be too risky to pour even more $$ into the next high-end CPU architecture that might come out in 4-5 years. AMD can't afford another Bulldozer II flop in 2016 that might actually send it into bankruptcy. Bobcat, Llano and Brazos have a higher potential to be more successful in the next 5 years if even more resources are allocated to them. Problem is Llano (or Trinity) would still be strapped with poor performing Bulldozer CPU foundation....and in 5 years if they don't invest into a new CPU architecture, then AMD's mid-range APU will become uncompetitive for CPU related tasks.
As for the GPU, the workstation market where they gained share, should drive further GPU development.
You can't just focus on workstation GPU market and abandon discrete GPUs for laptops and desktops. The R&D cost to make good drivers for workstations and complex enough GPUs that can be competitive is simply too high for a workstation GPU business to survive on its own. I have my doubts that NV would be able to sustain its Quadro market if it wasn't able to spread its R&D and other expenditures across discrete GPU (desktop and mobile) and its Tesla markets!