AMD and 3 core processors?

Lately some rumors appeared, that together with 2 and 4 core processors AMD plan to sell 3 cored ones. Of course, nobody want to manufacture this, but its way how to use 4 cores, where is 1 core bad. Just switch that bad off, and use it as 3 core processor. Hm, dont know how much people will buy this, but its interesting idea. At least this can help lower prices of 4 cores, because when you manucacture 4 cores on 1 silicon, there is high probability, that 1 core will be not functional. And of course, it is better to sell such processor at low price, than throw it into thrash.