Duvernay isn't a sure thing, but brings fresh new possibilities. Plus she did do a pretty intense, political and spy type action episode of Scandal that showed some chops for action and drama. From the controversies before with his Panther run some fans could get turned off from seeing it with Hudlin as director, though I'm sure many others still will go see it.
Like I said, nothing is a sure thing.
The momentum that Mr. Hudlin (and previous writers & artists) has maintained for the character should be enough to give moviegoers not overly familiar with Black Panther a solid point of reference. Unless you can provide some evidence (statistical or otherwise) regarding how some fans would react to Mr. Hudlin's name emblazoned on the movie's credits, the point isn't really that uncertain.
If Ms. Duvernay's research team is skilled, she could possibly pull off a satisfactory Black Panther movie for fans who have been waiting in anticipation for decades, I'd welcome it but wouldn't be my first choice for director.
In the movie industry game, utilizing the right elements will most certainly yield a sure thing.
How do you think the movie industry became what it is today? 
How do I think the movie industry became what it is today? The question nor answer has nothing to do with the point. You're talking like the movie industry has never produced a bad or financially failed movie even with the supposed "right" elements in place. I'm sure you know this isn't true.
And the point is neither my point or yours is certain or uncertain. Like I said, nothing is a sure thing. However, evidence isn't needed (nor is the point, but) since it was well documented on this board and others the dislike or hatred (unreasonable though some of it was) by some fans of Mr. Hudlin's Black Panther run. This dislike could carry over to the same fans possibly not wanting to see it because of that. I'd probably be less enthusiastic about seeing it myself as I wasn't a fan of it either, though I highly like some of his other works. And though he's known, it's not like the man is known on the level of say a Joss Whedon, who had a huge name for himself in the mainstream even before Avengers.
Again, not a sure thing. But again, nothing is.
And momentum that's been maintained for the character by Hudlin and other writers is highly debatable since that momentum has lead to Panther in the comics currently losing the sister Hudlin introduced, along with his kingdom and nation. It actually seems like they're stripping the character down to re-introduce him in the comics and the MCU, not carry over already established momentum. His introduction in the third Cap movie will most likely be the point of reference moviegoers not familiar with him will be given, seeing as he's playing a big role in that. So I think that point is immaterial.
Plus, you seem to be assuming that Ms. Duvernay, by needing a research team and what not, isn't aware of or hasn't actually read comics or Black Panther. We don't know that. But I fully understand why she wouldn't be your first choice of director. Heck, my first choice might be the Russo bros after Cap 2. But unlike you, Hudlin wouldn't be my first choice, and I probably would want to see Ava's vision before his again.
