To whom it may concern:
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.
(After the critical success of part II, and the strong box office sales of part III in spite of mixed reviews, will part IV finally see the June Open Thread jump the shark?)
Information processing isn't the whole story of what we care about. For example, the amount of energy available to societies and the per a capita energy availability both matter. (In fairness, Kurzweil has discussed both of these albeit not as extensively as information issues).
Another obvious metric to look at is average lifespan. This is one where one doesn't get an exponential curve. Now, if you assert that most humans will live to at least 50 and so look at life span - 50 in major countries over the last hundred years, then the data starts to look slightly more promising, but Kurzweil's never discussed this as far as I'm aware because he hasn't discussed lifespan issues much at all, except in the most obvious fasion. You can modify the data in other ways also. One of my preferred metrics looks at the average lifespan of people who survive past age 3 (this helps deal with the fact that we've done a lot more to handle infant mortality than we have to actually extend lifespan on the upper end). And when you do this, most gains of lifespan go away.
Good points. Still I feel that basing the crux of the argument on information processing is valid, unless the other concerns you mention interfere with it at some point. Is that what you're saying?
Good observation about infant mortality; there should be an opposite metric of "% of centenarians", which would be a better measure in this context.