I agree. It's not that big a deal, and I'm certain that Wulf means well. And I don't begrudge him the right to try and hang onto his own work as much as he can. I don't think the way he chose is quite legit, but I respect his reasons.
I'll even acknowledge that he's invoked a greater comfort zone (relative to something like adapting Ars Magica) in that he's made clear his intention to have something open, which would lead me to believe I could work something out with him. I certainly wouldn't want to send an email to the Ars Magica folks, to run my re-written adaptation by them and see if they thought is was sufficiently altered to be acceptable (though the response might be amusing to see). Whether or not he's used the OGL properly, Wulf has set things up so I would be comfortable doing something like that. He's established an intent to be reasonable about that sort of thing.
I, personally, don't think it would stop them publishing (though I can't say really). It would certainly mean a greater amount of "crippled" OGL. I get distinct the impression that a sizable number of publishers have begun to reconsider their generosity with open content already (especially some who've opened 100% of the text in most of their products). This is one of the flaws in the OGL. Like a rose, it may be a beautiful thing, but it also has thorns. Handle it wrong and it's going to bite you. I'd like to think that there's a balance to be found between giving it all away, and giving nothing away.
So no, I don't think the OGL wiki is a good idea (for a number of reasons).