This sort of touches on why I'm a bit anxious about the new version of the GSL. If it's friendlier to third-parties, it could hurt the existing 3.5 community.
I know that sounds rather awful (and quite possibly selfish), but when the current GSL debuted, it made a lot of companies who would have produced 4E materials balk, and in some cases kept them in the 3.5 camp. Needless to say, for those of us who had no interest in switching editions, this was a great thing, as it kept some of our favorite companies producing the materials we wanted to see. However, solidarity fades away if there's a lack of opposition, and I'm worried that if the new GSL is friendlier, those companies will drop their 3.5 support for 4E.
i look ast it differently. in spite of my cynicism, and dislike of 4e, i hope that 4e thrives and that the gsl is open enuf that all the 3pp's sign up for it.
right now the consumer bases are split in 2 groups, 4e and "other", with "other" being mostly 3e, 3.5, or paizo. before it was one group. that means for anyone producing for just one group, as the current gsl makes people do, the 3pp's (and wotc) lose half of their former income.
if the gsl is very open, almost an ogl of sorts, 3pp's will then be able to make more money off of both groups, thus enabling them a better chance of staying in business. if they stay in business, we all get more and better stuff, for all versions of the game.
so though i am cynical of the reasons, i am appreciative of the effort, and hopeful of the outcome.