Intel has a massive R&D budget. They'll probably be the first to achieve post-silicon tech if nothing dramatic happens. So the question is whether they'll be quick enough to innovate before generic chips eat their lunch.
I don't doubt that they are a front-runner for post-silicon tech. The question is whether they'll be able to sustain exponential growth in performance. I have my doubts. Radical new technologies are far less predictable than iterative ones.
