I suspect that most of the common character classes and races that exist would be public domain.
Yeah, several lawyers mentioned this, but for me the implications are starting to sink in.
Most of D&D is a relatively straightforward import of public domain concepts and noncopyrightable systems.
By undermining the OGL 1.0a, and causing the gaming community to no longer sign onto it, WotC actually loses its own contractual protection of the SRD property.
All of the SRD is trivially clonable.
Compare the "Drow" that Gygax pieced together from disparate public domain sources:
• Norse Dvergar
• Scottish "Drow" (a kind of small troll)
• Jewish "Lilith" (whence Lolth)
• and curiously a Norwegian folkbelief that identifies "Lilith" as the mother of the hiddenfolk
• Greek Arachne (whence Spider)
• Tolkien adopted the scholarly speculation that some nature beings were tales about human ethnicities of flesh and blood
In my eyes, this particular "alteration" is distinctive enough that Gygax can copyright his own version of a drow.
But the elements that construct it are strictly public domain.
It is trivially easy to rewrite a new version of a "dark elf" or "unseelie elf", while drawing from the public domain.