I am ambivalent about 4e now and if Chris is right, then I will have no interest in 4e whatsoever. 3rd party publishers have IMO created some wonderful materials for D&D in 3e and 3.5e. Of course there was crap, but Paradigm Concepts' Arcanis, Fantasy Flight's Midnight and Dawnforge, Mongoose's Conan D20 (not D&D per se but damn close), Green Ronin's Book of the Righteous and various race books, etc. The market sifts out the crap on its own. Gamers don't need to be protected as if we can't make our own choices about what we will or will not buy.
I'm am writing up a setting now (my homebrew for many years) most likely as a system free setting with free add-on rules for True20 and most likely Runequest. I would like to do the same for 4e but an overly restrictive GSL will prevent that. What I dread is recreating what has been recreated very well under the OGL. I consider myself an excellent fluff writer (if I do say so myself

) but only an "ok" crunch writer. There are certain OGL mechanics that are very good as they are and I know I cannot improve upon them save as to tweak them for setting specifics. I acknowledge my limitations and am grateful to be able to fill in the cracks in my own abilities with the innovations of others.
And the bottom line for me is that I am only going to play what I can write for. Firstly, this is because I can playtest new concepts in the context of the game before releasing it and also I have no interest in supporting anything that is an attempt to turn back the clock on the cross-pollination of ideas that came with the OGL.
If the GSL is overly restrictive, I hope that Green Ronin, Mongoose, Paizo, Paradigm Concepts, etc. choose to keep with their own systems and keep the OGL alive.
Wyrmshadows