Echohawk
Shirokinukatsukami fan
Well, it's possible to reach any conclusion if you just make up factsI believe if you count the monster books, Paizo is averaging a mechanical supplement about once every 4 months. At that rate, I believe it will take them something like 15 years to reach the saturation point of WotC's 3.5 mechanical supplements.

What are you counting as 3.5 "mechanical supplements"? The core rulebooks, plus the Complete books and Expanded Psionics Handbook? Does the Races of series count? What about Draconomicon and Libris Mortis? Frostburn? Heroes of Battle? I'm not sure it is fair to count all of those without also counting a lot of the Pathfinder Companion/Chronicles series.
By my count, excluding only adventures, WotC released 6652 pages of material during the first two years of 3.5, while Paizo released 3832 pages of material during the first two years of Pathfinder. That means Pathfinder has a release rate which is about 58% that of 3.5. Since 3.5 had a 57 month lifespan, extrapolating that gives Pathfinder until November 2016 to reach the same saturation point. That's still some time away, but a lot sooner than 2024...