First we had straight up CPUs... then they got Math Coprocessors... then video cards started having their own GPUs... and then there came physics cards to handle complex geometry and effects.. and now Intel is thinking about putting in special hardware to detect things like aimbots and map hacks.
I don't think it would work out too well.. it just forces escalation. Kinda like how the RIAA simply forced escalation by squashing napster. Sure, it might catch present methods of cheating, but to fight it you need something that can change and keep up, like punkbuster software. To incorporate it into hardware is to remove the agility required. It'd be like "virus detection hardware." Just too much difficulty and expense to keep current.