Yes, I would imagine if the amd chips perform the same or better, the price will also be the same or higher.
And that's my take on this whole situation, it doesn't really matter if BD whipes the floor with SB, which it wont, it would only mean it's gonna cost more. Amd is on a budget because most of their cpu's are slower compared to the ones from intel.
I see the same with videocards, either amd or nvidia, the faster card will cost more.
Anyway, it's interesting for sure and if one is inclined to leap over to amd, then it's best to wait a little longer. But I don't believe a faster amd cpu will cost less than a sandy bridge cpu.
In games they've said the BD slaps the Sandy Bridge and in Benchmarks it's faster than the i7-2600K and about the speed of the Gulftown i7's. Now, obviously until us, the public actually get our hands on these for ourselves we won't know. But I do believe AMD is really making a leap with BD and a good one, now I do believe that Intel's Ivy Bridge CPUs are more than likely going to outperform the BD.
As for the cost, I posted in article in the BD Rumors thread, it said since the BD does outperform the SB by quite a bit it was expected to be $320-350 (more than the i7-2600K) but AMD came out and said the price for the initial high-end release, the FX-8150 will be at a dead $300. Say what you want, Intel makes the faster CPUs but AMD's price/performance ratio is bar none. Especially if BD is "that much" better than SB.