I believe that one of the reasons for the discontinuation of this is because of the advent of the 64 bit processor. As many of us know by now, the 64 bit CPU will run over four billion times faster, or at 2^32*2^32 bit processors. I believe that because of this, it is no longer needed to double the number of transistors every two years. However, I believe that Moore's law may kick in again a year or two after 64 bit processors become the standard, and are used up to their full potential.

I may, of course, be wrong about this. Anyone else have any input?