It's always interesting to look at what happened to technology during WWII. On both the German and Allied sides, the development of high technology was utterly amazing. But WWII was a significant social disruption and unifying mobilization of peoples. We haven't even begun to see anything nearly equivalent as the result of recent energy price moves. The MSM isn't even talking about it all that much.
Still, if you look for it, you can find plenty of buzz over sustainability and alternative energies already. People are already innovating and making plans for an energy-reduced future. I wouldn't write-off entirely new energy sources like fusion until such efforts have proved fruitless even when the pressure for results is intense.
Still, it seems hard to argue about the full range of resources that are rapidly being depleted because of human overpopulation and hyper-consumption. I was listening to Nate Hagens from The Oil Drum talk about this briefly
here today ( I know, it's a year old). So this is why I think that there could be both a population reduction as well as dramatic advancement in high technologies. The trend of rapidly advancing tech is just too profound to ignore.
I even think that somewhere a deliberate population reduction plan must be contemplated as a contingency - much like there must be a contingency plan for the invasion of Canada somewhere in the Pentagon. somewhere, somebody is asking the question: is it possible? How quickly could it be accomplished? Could the societal disruption of population reduction be minimized? How would it be explained to the survivors, etc.
Maybe afterwards, the future will be a mix: Low-tech, energy-efficient, self-sustaining communities in which it is possible to live in a more relaxed communal way, alongside extreme high-tech campuses of one sort or another. Who says ultra high technology is necessarily dependent upon industrial civilization and overshooting population?
Personally, I think it is indelibly human to advance through the application of the scientific method. It's a trick we've learned that we could never now unlearn.