Here's the thing about that: the "uncertainty" around the OGL comes from not being sure whether or not WotC could actually live up to its threat of revoking the OGL. Even though most people (including most of the lawyers who chimed in on the issue, here and elsewhere) were pretty sure they couldn't actually follow through on their threat, no one was 100% sure about that.
More importantly, no one wanted to be the guinea pig who went bankrupt trying to prove that in court.
But what most people seem to have overlooked is that this same scenario—where WotC issues a legal threat that seems dubious to most people, but no one is completely certain, and nobody wants to be the one to try to put the lie to it—is just as true for the CC as it is for the OGL.
True, WotC doesn't own the Creative Commons like they do the Open Game License, but that's a distinction without a difference