There was a bit of a kerfuffle last night on G+ regarding the OGL, as one small publisher has taken to republishing another small publishers work word for word - no addition or subtraction, just a copy paste job. Legal under the OGL, but bad form and in and of itself a reason not to leave one's products totally open under the OGL (my suggestion was to ensure each product contained Product Identity and designate that pieces as such.)
Sine Nomine does fine publishing OSR products under copyright - no OGL. Others do the same even though the vast majority do publish under the OGL.
Now that the cat is out of the bag and the OSR is full of clones and such built upon the OGL, how needed is the OGL going forward?