I tend to agree with you there, eventually physics are going to get in the way.
conductivity can be improved to drop the temps some, reoptimize for smaller die, .10 micron or such, etc...
eventually it will reach a point where the transistors can't operate faster.
There will physically be a dead end point, 10 billion cycles per second is pretty damn fast, when will the speed of electrons moving over the conductive substance be the limit?
2ghz is fast, 10 is freakin awesome, but there will be further hurdles to pass if it comes to be.
and, to play devil's advocate, it was said in the days of Pentium 100s that we'll have to go to fiber optic because of the limit of electricity.
who the hell knows.
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Independant thought is good.
It won't hurt for long.