I'm not sure Nick knows that there are Avatar comics.
After all, they refuse to license LoK to any potential soundtrack producers, and I can't imagine the comics are bringing in more money than that. Comics are a very low profit margin business.
As far as comics go, Avatar is a very profitable franchise. In fact, with the loss of Star Wars, it's THE most profitable franchise Dark Horse has. Even if Nick forgets they exist, DH won't.
Well, yeah, but Dark Horse is in a low profit-margin business. Paramount probably doesn't even know what a comic book is, outside of somehow inspiring that Iron Man movie that at first seemed to make the executives gods and now has spawned an unbeatable rival.
On a side note: As flawed as they are, would you guys be opposed to them turning them into DC-style animated movies after Book 4 of Korra is done?
Only after massive rewrites. As is, I wouldn't want them to get the legitimacy of being animated.
But
Under the Red Hood proved that such improvements are not only possible with the same creative team involved, but can really achieve great new heights.