Remember Kakashi said that those in the jounin level usually have atleast two elemental affinities2) Combining 2 elements doesn't seem to be a Kekki Genkai.. Granted only the 1st and Yamato can do Mokuton.. this may be because of balance... like Naruto in sage training.. if he couldnt balance the chakaras he'd turn into a toad.. This is semi supported by the Danzo fight.. where he started turning into a tree.. he couldn't maintain the balance, and so it started to take him over.. I could be wrong but combining to elements to create a combination of the 2 just doesn't seem like a KG... I think that like with becoming a Sage, the user must have a Huge amount of chakara already in order to keep things balanced.
3) If the Uzumaki clan came from the whirlpool village, the 1st and Haku both had Water as their main elements, and added the other to create their unique jutsu's... Wouldn't Naruto's main element be water then and not Wind?
Also during his element training, wouldn't he have shown another affinity for a different element? I don't think he'd just wake up and say "Hey.. I'm gonna use water elements now.." I must say that your Ideas are very feasible though.. I'd like to think that Naruto's second affinity would be fire.. Combined with rasen shurikken... I think that may put a dent in Ameterasu..
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. So it is possible for naruto to develop water later on.And a kekkei genkai is the combination of two elemental affinities,
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. So if naruto develops an affinity for water he can have the same kekkei genkai as Haku because he will have both water/wind elements and be able to create ice. I dont know if something else could emerge from those two elements, but hopefully if naruto does have another elemental affinity it will be something unique like wind/fire or wind/lighting LOL or maybe wind/earth dont know what would come out of that but lol i sure would love to find out. But if he does have wind/water it would be cool too.