I wonder if you wandered into 100 high schools across the country during breakfast how many would have games of D&D going on at that moment? I suspect in the early to mid 80's it would have been 100 out of 100. I think if you just count "games played" as a metric that 1e D&D is still king. There are a lot more ways to make money these days and the company has figured out better how to reach their market.If well we have sales figures for 2E confirmed now and they were in line with ones floated earlier.
If those 3E ones are accurate it outsold 3E.
The only claim Paizo actually made was PF outsold 4E at a certain point in time not lifetime sales.
Anythy beyond that is internet scuttlebutt. The claim is in Paizo retrospective that's was on their website.