Hey, if the revised
GSL ever arrives and isn't too bad, I'm totally with you with the material I plan to publish! I've been wondering about ways to "open" my
4e content.
At some point there would have to be an official license, but most likely it can be kept pretty simple. Basically a "you are allowed to use this material with attribution in any
GSL covered products" sort of thing. (One thing I didn't like about the
OGL was the lack of attribution other than the roundabout Section 15, or contacting each publisher to ask.)
As long as whatever agreement states that the material can only be used in
GSL covered products, I don't see any problems. Although you are not planning on re-creating the core content and are just looking to share your own paragon path, for example, it could get a little dodgy if you allow a publisher to re-use your paragon path in a non-
GSL product since any game mechanic will carry remnants of the core rules in them (even the basic concept of a "paragon path"). Yeah, there's grey areas to dance around, but to keep
WotC happy and not wanting to yank your
GSL from any imagined threat, I'd make the agreement stipulate that the content can only be used in a
GSL covered product. Extra CYA doesn't hurt.
But, like I said above, if there's ever a version of the
GSL I'm happy with, I'm totally with you on this!