Will they? No. Comments are essential to the social media nature of Quora, and the social media nature of Quora is not intrinsic to the stated mission of “to share and grow the world’s knowledge”™. In fact, I’ve read here that Adam D’Angelo wanted to do away with comments altogether, and had to be talked out of it.
No, I can’t find the source statement now, because Quora Search. And possibly because it was in a comment, and comments aren’t searchable. The source, I think, was the Facebook Secret TW Group.
The fact that comments aren’t searchable, though, is a kind of indirect confirmation.