I've thought of a SEDE project that would be very interesting, but I think it would require a time machine, and unfortunately my flux capacitor is busted. I'd like to know what the percentage of high-rep (let's say 10K+) users looked like at StackOverflow over time. At the beginning, of course, there are none; and the longer the site exists, the longer folks have to accrue reputation. But there are more users all the time... it's complex. Has anybody looked at this data, for SO or for any other SE site?
The stimulus for this was watching obvious dupes be multiply-answered today, and wondering where all the high-rep users are to close them. It makes me wonder if the percentage has peaked and is now on a decline.