Actually... you need variable resistances. You need high resitance for some parts, low for others, but mostly semi-conductors that you can change their resistance. Otherwise, you can't build the necessary circuits.
Newer CPUs do not have less resistance or anything, they just make the parts smaller, so they can cram more on to the CPU board. The problem is, the smaller you make it, more of a problem the electric fields generated by the parts get.
Fiber optics might be one area where they could drastically change CPU architecture. Or those organic computers some people are trying to make...
[ November 08, 2003, 20:10: Message edited by: Imperator Fyron ]