Here's the problem.
Very few graphically intensive games are built with the PC in mind. If you take Crysis out, (and even then , I believe I read somewhere that the company is going to be putting the Console as its priority in the future), then what you have left is a plethora of strategy, RTS, and ports coming to the PC.
So while you can "make" a PC that would crush any console on the market, you wouldn't be able to take advantage of it nearly as much as you used to be able to.