I agree the knowledge base lack of visibility but I don't think the wiki link should be replaced by the KB link, at least not as long as there are so few datas in the KB ... I mean : currently in the KB there are only achievements and quests but not even all of them; it's rather empty compared to what we can find in the wiki : there is nothing regarding how to play the different aspects of the game, formulas, gear, crafting or even the rules of the game lead to a link to the wiki. For a "help" link in game, currently the wiki is much more helpful IMO.
On the contrary, until KB is filled, maybe some links to the KB could be added in the wiki ? They could be placed in the home page and in the achievements list page, to inform players that new quests and new achievements are there and the wiki isn't updated anymore regarding these subjects. IMO the link to the wiki should be replaced by the link to KB only when KB provides as much info as the wiki does regarding most of the other stuffs, especially the guides explaining how to play each parts of the game.