CharlesRyan
Adventurer
The only thing about this that affects me is that you still can't put the monsters IN the adventures. I'm sorry, but I'm spoiled by the WOTC adventures, and it's VERY nice not haivng to get out my Monster Manual during combat. I don't even need much prep work. Unless publishers use their own monsters, I'll probably pass on buying any 3rd party adventures.
I don't want to sound dismissive, because this is a legitimate concern. But there's also a juicy irony to this.
In the OGL era, adventures were specifically one of the categories of product that WotC wanted to see the 3PPs pursue. The 3PPs, in general, concluded that they didn't want to be stuck in such a loser business, and instead flooded the market with splatbooks. Seeing a hole in the market, WotC returned to the adventure business. And now there's an outcry that the GSL isn't friendly enough to adventure publishers. I love it!
(Note: I say "the 3PPs as a whole," fully aware that there are exceptions--companies that didn't view adventures as "WotC's table scraps," but rather as an unserved market need. I'll note that those companies have a much higher survival rate into the current day than the overall field of d20 publishers.)