Then again, a reference still need to target an audience large enough.
I consider myself a fan of Divinity having played more than two hundred hours on the game, and wouldn't get that reference, so yeah, I think it's obscure enough...

Plus it would be kind of sad for people not to even be able to join the private circle of those in the know because the source of the reference does not even exist anymore...

The point of a reference is to embrace a community not to serve as a wink to only a chosen few.