Jan van Leyden
Adventurer
You can still get in on the ground, more or less. Plus it's at least all available as pdf (and much of it is available in hard copy, still).
In a few year's time, there's going to be a lot of stuff, though, for sure. I am a superscriber so I get it all but other people will want to pick and choose which regions and general issues they care about.
From what I gather, Paizo has two bi-monthly product lines (Pathfinder Companion and Pathfinder Chronicles), which act to help fill in some of the gaps of the Golarion setting. That said, the books are only 32 pages, and are more gazetteer-like, leaving lots of room for individual GMs to tailor a region to their tastes.
So I'm looking at 12 products per year, each with 32 pages, totalling 384 pages. Plus the 12 adventure path modules per year, each of which also contains background material (Shadow in the Sky - the only Pathfinder book I own - delivers some 40 pages). In total I expect 700-800 pages of source material for Golarion per year. No, I wouldn't call Golarion a world it's easy to keep informed on.
Another point is the generic approach other people quoted as advantage. How generic can a setting be, with so much stuff being published for it?
Saying that there are elves living in the forest of Treeparadise with their Queen Beautyleaf regining from the capital of Acorntop is generic. But after publishing a 32-page sourcebook on Treeparadise, a 24-page AP article on Acorntop, and using the queen's evil cousin as major villain of an AP?
You either restrict yourself to selected sources, develop the rest on your own, thus remaining the generic apporach but possibly invalidating later publications - or you try to remain true to the official Golarion and take the contents of publications beyond the core book for granted, month for month dropping more of the genericity.
Golarion will probably develop in a way similar to the Forgotten Realms - if one omits the FR novels: lots and more sources, impossible to get a complete picture, and unwieldy for anyone not on board from the very beginning, but very detailed and probably very consistent. I just don't know whether I find this good or not.
