mythusmage said:
Here's a question for you. What about a slow apocalypse?
Depends on whether resources are destroyed too or not. If not, I guess we could all gather in a resourceful (ie, urbanized - the most important resource is going to be technology) continent, such as Europe or some part of the USA (the whole USA is too much for 60 million people). There we'd sustain ourselves well enough.
OTOH, the only reason for such a decrease I can think of is some sort of disease, which kills fast but not fast enough to be a real sudden cataclysm. So, those 60 million people would tend to live far away, so as not to catch it from someone else. In 200 years, a real culture of avoiding contact could develop. With all that time, communication technology would progress to the point where physical contact is practically unnecessary, artificial fecundation would be the norm, and a lot of automation for industries and agriculture would be developed. Overall, not really an apocalypse. Just a lot of fields and factories without a single person inside, manned by robots, empty roads, and large houses where a single person lives (and DMs D&D for his friends all the same, except that they are in holographic projection). I read a sci-fi novel where there was a planet where people lived like that, for fear of diseases.
If technological resources are slowly destroyed together with the people, then you have a problem. You don't have the abundance produced by 6 billion people behind you. Gathering everyone in a relatively small area rich of natural resources is mandatory. Developing automation to create more technological resources without using precious manpower is needed. In 200 years, I guess there would be no problem.
In no case I see the technological level getting lower. It happens too slowly, people have time to adapt.
Now, I told ya I would tell why I'm discussing this topic so much. The reason is, my setting submission starts out as a technological, no-magic world where a very weird sort of apocalypse takes place... and I wanted to see if the consequences I envisioned were correct. Seems like 90% of the population dying from disease, famine and strife (and other more weird factors) was a good estimate.