I have a soft spot in my Big Red Machine heart for AMD. When I got into this hobby, I did so with my first custom-built PC based on a Socket 939 Athlon 3700 San Diego. Almost everything I know about being a PC enthusiast - troubleshooting, mods, overclocking, water cooling, etc. - I learned on an AMD-based system.
Even today my daily driver is still based on AMD, though I do have a P67-based system waiting for a couple more water cooling-related parts to come in before I go all in.
It's a nice thought to believe that Mr. Keller's return to AMD might auger better times for fans for the brand; he was, after all, part of the team that brought on K8, which was the last CPU architecture that ruled the performance stakes that didn't carry an Intel badge.
Unfortunately, I think the more realistic scenario is for AMD to continue on its value-oriented philosophy and market approach, with a growing emphasis on the mobile market. Mr. Keller's expertise also extends to SoCs, after all.