Sure do it to recover bad cores. But let us not pretend it is anything else. Think about the realities of pricing.
An Intel Q6600 is only $50 more than an E6600. So if AMD were to compete the same way, the tri core would be $25 more than dual?
This might have made sense if AMD got to quads first and was the only game in town where they could charge you $400 for quad, $300 for tri and $200 for dual, but with intel squeezing the quad core margins, I think they will pretty much have to sell at almost the same price as duals to move.
not if they rid themselves of single core SKUs, make tri cores the new dual core, and dual core the new single core.