AMD already does this with their Phenom II X2 and Phenom II X3 CPU's, most are quad cores with one or two cores disabled but you can't unlock them without voiding your warranty. If I didn't have much money for a build I wouldn't mind buying a cheaper CPU, then later once I get the money pay to for the more expensive one buy an upgrade card rather then buying a new CPU.
Although I would think most tech people like us would love this because it means that someone is going to find a way to unlock it without buying a card, so that means better CPU's for less money.
Although I would think most tech people like us would love this because it means that someone is going to find a way to unlock it without buying a card, so that means better CPU's for less money.