They keep saying that we're at the end of Moore's law, and then they find ways around the problems. Last week I read about some company in Japan researching the use of diamond (I assume artificial/man-made, not the natural stuff as that's too small/expensive) as substrate material, as it would do much better with the thermal issues. There's also research being done into stacking transistors, similar to stacking seperate dies together but it would be all on the same single die. There's also the optical chip research out there, to replace electricity with light. I don't see anything to be worried about.
