One can only wonder though if they've already soured the pot by first delaying and then putting out the initial -horrible- GSL? Whatever this ends up being, it might be too little, far too late.
I really don't think that would be an issue to most companies. For most of the bigger-name d20 companies, business is business, and if the terms of the new GSL are amenable, then I can see every one of them using it sometime in the future (if not the near future, due to their current schedules).
[gleeful speculation and rumor-mongering]
And speculate as you like if it might be a late attempt to head off OGL alternatives to 4e, especially if sales thus far for 4e have been good but not up to what Hasbro expected given the investment in the edition change and its associated digital products.
[/gleeful speculation and rumor-mongering]
That, on the other hand, I could see, because the fan community holds grudges far longer than publishers do; the goodwill may already be spent, and an OGL challenge to the GSL, or EVEN MESSIER, a copyright law-based challenge to the GSL, might gain ground.
In either case, I look forward to an amended GSL. Hopefully, 3PP's will find it palatable enough to use, and we'll see some high-quality companies starting to enter the running. I like a lot of WotC's product, but let's face it, a LOT of good talent has left those training grounds into other companies, people who could add some seriously good material to 4E.