Here's my two cents (Note: Me + Shipping= Could careless.)
1. The Fortune Teller could have been seen two different ways: that Katara didn't like Aang or that she was so busy with all the fortunes she was being told that she never really THOUGHT about Aang until at the very end of the episode when Sokka mentioned that he forgot how strong of a bender Aang was. (And she was told she would marry a strong bender.)?? For the entire episode, I find it remarkable so many people have forgotten the small yet seeming significant part of the entire episode.?? I've heard people say that 'strong bender' remark could be ass. with Zuko but then again, that really depends on if you think Zuko is that strong a bender to begin with.?? ::hunches::
2. While there are hints to Katara & Aang, those exact same moments can be taken differently.?? For example: we know that Aang likes Katara.?? But that doesn't mean a thing if it's all one sided.?? And even I have to admit, expect for few moments (and Zuko/Katara have had fewer if any at all, just admit it) it appears more to me that she seems him more like family than a potiential boyfriend.??Personally, I wouldn't mind seeing a show where the main guy and girl don't have to become love interest--I liked thinking it was more of a 'family relationship'.?? But even if Katara doesn't like Aang, that doesn't mean by any strech she likes Zuko--actually, if memory serves me correctly, she still has some, even if they are light, feelings for Jet. ::winks::
3. As for Kutara/Zuko--to be honest, the pairing annoys me, because it almost appears that they're being shipped for cliche' reasons. (And let it be known that Kat/Aang annoys me to some degree.) One has the elmement of water, the other fire, their personality clash to some degree, every little moment they share is somehow twisted into cannon shipping (Not as bad as Hermione/Harry from that shipping war but hey...)--the only solid thing I've seen IS Katara touching Zuko's face and even that's questionable given the reason.??
4. Though I agree that it's not solely fan girls of Zuko that want to see Katura with him (I personally, don't like the idea at all...) but it might a few things: 1. Some people like so-called 'far-fetched' ships.?? I'm one of them, though I think this is just as cliche' as Kutara ending up with Aang. 2. Zuko is a 'rival' of sorts and I've noticed people love pitting love interest in the way of rivals. 3. Both Katara and Zuko, while not the main character of the story, are important secondary characters and it's a common thing to always pair of the main characters with one another.
Overall, I can't help but think both sides are going to be slightly disappointed with how the season finale turns out.?? Hence, why I'm watching it for you know--the entire Azula in BSS thing and what the heck is up with the Dai Li.?? Oh yeah...and my favorite earthbending loud mouth, Toph.