the reason Why I think naruto WON"T get a second element is that he is supposed to be the exact opposite of Sasuke and also a balanced opposite, in abilities and personality and how he get's his abilities. so far his only element is wind which is the exact opposite of sasuke i think, cause fire is stronger than wind, but lightning is weaker than wind, sort of making wind his exact opposite being weak against half of his abilities but strong against lightning. If he got fire or lightning element he would be copying Sasuke and it wouldn't be perfectly balanced opposite. if he got earth it would mean he was weak against sasukes lightning element making 2 of his abilities weak against 2 of sasukes elements but only 1 of his elements strong against sasukes elements, if he got water he would have 2 elements which are stronger than 2 of sasukes elements, but only having 1 of his elements weak against sasukes elements. Now everyone was hoping for naruto to get a second element, but instead of an element I believe naruto get's chakra manipulation which is what he already has, and is not even on the chain thingie of one element being stronger than another and so on, which makes it a balanced opposite of Sasuke cause it is neithor especially strong against any of his abilities, nor especially weak, he will develop new forms of rasengan, and create more chakra manipulation techniques such as "that jutsu" see what I mean?