You seem oblivious to "modern" day tech. It matters not what the market looked like 6 years ago. The PPC 60x series were not multicore until the very ends and the development tools were nowhere as sophisticated as they are today. We cannot glean much from what the market was like a half decade ago and apply it to today and future computing needs.
AMDs roadmap, on paper, is strong for 2011 provided they hit their targets and deliver.