beta_medic -
For the record, I have a bias against least-common-denominator/one-side fits all arguments, but you make several interesting points. Here's what I would offer in reply:
1) I don't think you can assume stone age society right off the bat. Eventually maybe, but not at first. I might be going way out on a limb here, but what do you think of this scenario?
The only way life hypothetically goes on is if there are survivors, i.e. 21th century men and women, endeavor to create schools and pass along whatever knowledge the have to their children. Other people will go around talking to as many survivors and trying to document as much knowledge as possible. We have people who do that today, so it is reasonable to assume that trend would continue, yes? If they succeed, modern society could reemerge relatively quickly, like post WWII Germany and Japan did. In that case advanced books would be very helpful. The knowledge was already there, in a manner of speaking. If they fail to rebuild and reorganize then I imagine the knowledge will be lost in a few generations. Things will probably regress to pre-industrial society or worse, in which case book in general will have very little value, no matter what is in them, for hundred if not thousands of years.
2) Any advanced knowledge is always concentrated into small groups, mostly, IMHO, because specialized knowledge is uninteresting to non-specialists. If an advanced text got into the right hands, someone would eventually figure it out, no matter how advanced, and put it to use. That's how we are as a race. Inquisitive. So I personally wouldn't worry about needing to dumb down material for the general public, because they won't need it or use no matter how dumb you make it. But the bright guys and gals will, as long as they get while the batteries in their calculators still work, but that's a fourth book isn't it?
3) If high level of specialized knowledge were left behind, it would do at least 2 good things:
a)It would enable growth at a faster pace, thus allowing greater specialization faster and faster, thereby easing starvation, pestilence, hopefully a variety of preventable suffering, as more good minds can be spared from subsistence living to engineer, research, dream, invent, philosophize, etc..
b) Also it might dispell, by our example, the hubristic notion that a society can somehow magically industrialize and technologize its way out of needing to also be good neighbors, good parents, and nice people in general.