Keller may be good, but it's nonsense to imagine he will spend time doing engineering work. He is a manager, his time is expensive, he has duties to his functions and if he doesn't perform them. He needs to ensure that there won't be another Bulldozer receiving money in the R&D pipeline, and that the right projects are provided with enough resources. He is also responsible for the trade offs at the concept level.
If Keller gets down to the engineering level to do engineer's work, not only he won't solve AMD's engineering problem, he will also leave AMD without sound management, something the company is sorely lacking.
Keller is good. The problem as I see it is that I'm guessing people here (not everyone of course) simply have no personal experience in witnessing just how large of a challenge it is for a large scale project to design a modern multi-billion xtor product so as to have an appreciation for how much of a group effort it is.
Via has brilliant people too, why aren't they rivaling AMD? Its easy, two reasons, (1) not
enough brilliant people (hundreds can not do the work of thousands), and (2) not
enough R&D money (hundreds of millions cannot fund the work than needs billions).
This is continuously sliding scale, and all that determines your position on the scale is your headcount and funding. That is what makes Boeing able to build the 787 and Airbus build the A380 but no others can build to similar scale. Same with AMD and Intel at 45nm and 32nm.
But 20nm and lower, it just doesn't work out for a business that is AMD's scale anymore than it worked out for a business that is Vias scale to put out a 28nm of the same complexity and die-size.
I do like the notion of a white-knight funding savior coming in and pumping a few billion into AMD. That would change up the game considerably, at least delay the inevitable for another node or two.
But to make the argument that one man alone makes the difference, sure it is possible, be him viewed as messiah or prophet or mere myth Jesus made a huge difference on mankind too, so maybe Keller is of comparable level.
But we cannot confuse what is possible with that which is probable.