Ruin Explorer
Legend
Yeah someone actually enumerated the claims here:That was a complicated case - some judgements went for GW, some against. It looks like they'd obviously listed absolutely anything they could possibly think of, to see what they could get away with, from fairly solid claims to fairly ludicrous ones. It also didn't involve any type of license, and wasn't as simple as just quoting blocks of copyrighted text because it was expressions of imagery that were not exact copies but were "close to" the GW originals.

Chapterhouse & The Last Time GW Went To Court Over Copyrights
Follow along with all the highs and lows from the Chapterhouse Vs. Games Workshop case- the last time GW went to court over copyrights. Depending on who

Re: listing absolutely everything, that's the approach TSR took with GDW back in the '90s, too. Unfortunately GDW didn't want to pay the lawyers (EGG implies they could have but it wouldn't have been worth it) so they settled with TSR rather than fighting them. If they had fought them, I expect a whole bunch of stuff WotC might try to claim as belonging to D&D would have been adjudged otherwise long ago.
I must admit I have no idea if the "list everything, however dumb" approach is routine for US copyright cases.
Yeah it does depend on how WotC approached it. I have difficulty envisioning a scenario where WotC doesn't end up having to list what it thinks infringes, though, and I don't think any scenario where that happens will be a remotely clean win for WotC, because you can almost guarantee some of the stuff they're claiming will be found not to infringe - and yeah possibly everything except the OGL 1.0a itself, even!For this hypothetical, I think we're not going beyond a legit SRD/OGL usage and WotC claiming they've de-authorized the licence permitting it. Although there is the possibility that the license was invalid but that they still did not use enough significant copyrighted material for it to matter anyway. (It could end up being as amusing as the only infringement being the copy of the OGL itself)
Of course there's the possibility WotC just sulks and lurks as people continue to use the 1.0a licence, then waits for what it thinks is a more blatant copyright violation than the SRD, and tries to jump on that. Again though, I don't think that's going to go great for them. Especially as when you're trying to make money from a product as intimately connected to its fans as D&D is (far more intimately than any videogame, even MMOs), you can, should, must and will be be tried in the court of public opinion by your own fans.