First of all, it seems pretty obvious to me that this is a "test" for Greyhawk. But of course it's a test - every product that every company ever puts out is, because it helps them decide what to make next! And I'm quite sure that Mr. Rouse and others (who have been kind enough to participate in this thread) are well aware of the many ways in which it is an imperfect test (not everyone buys adventures, not everyone who buys the adventure will do so because of Greyhawk, etc.). But I am quite sure that, to the best of their ability, they will try to interpret the data that comes in use it to make sensible decisions about Greyhawk.
Second, I was around for Greyhawk the first time, and if all you want is the folio...well, all that information is already out there! It really didn't contain much detail, after all. Continuing support for Greyhawk, almost until Second Edition, was entirely through adventures. Paizo has taken this to heart with their new setting and will build it entirely through adventures. Obviously that is not the usual way these days, and I don't know that it will work, but I am really interested to see how it turns out!
Finally, it is not clear to me that WotC ever really thought two settings was the maximum. Really we've had 2.5 or so, because Paizo has stepped in and supported Greyhawk reasonably well (thus pulling people from WotC products, with their tacit approval). Now that WotC has pulled that content back in house, it may well be that they want to support more settings. In fact, the Digitial Initiative may be a great outlet for sporadic but continuing support for many of the old settings, or even new ones. Online delivery has (supposedly) made the "long tail" of niche products profitable again, because delivery/storage is so cheap. I've no idea if that's actually true, but the idea is a big deal in the business world now. I personally was very upset to see Dragon/Dungeon go, but if WotC takes the content in this direction, I think that would be great.
Second, I was around for Greyhawk the first time, and if all you want is the folio...well, all that information is already out there! It really didn't contain much detail, after all. Continuing support for Greyhawk, almost until Second Edition, was entirely through adventures. Paizo has taken this to heart with their new setting and will build it entirely through adventures. Obviously that is not the usual way these days, and I don't know that it will work, but I am really interested to see how it turns out!
Finally, it is not clear to me that WotC ever really thought two settings was the maximum. Really we've had 2.5 or so, because Paizo has stepped in and supported Greyhawk reasonably well (thus pulling people from WotC products, with their tacit approval). Now that WotC has pulled that content back in house, it may well be that they want to support more settings. In fact, the Digitial Initiative may be a great outlet for sporadic but continuing support for many of the old settings, or even new ones. Online delivery has (supposedly) made the "long tail" of niche products profitable again, because delivery/storage is so cheap. I've no idea if that's actually true, but the idea is a big deal in the business world now. I personally was very upset to see Dragon/Dungeon go, but if WotC takes the content in this direction, I think that would be great.