Seriously,
the Naruto/Sasuke fight of first gen was awesome (Kyubi Power, great fight, epic place for the fight).
I fear the final fight will just be a DBZ fight, Hope Kishi will not screw it.
This is the only thing i dont want him to **** up.
Seriously now what could be the reason Sasuke wants to kill Naruto ?
There is no reason actually. Same for Naruto, why would he wants to kill Sasuke ?
To answer the question "How can the final fight be better?" while ignoring the rest of opinions and such you've made.
1) Both Naruto and Sasuke are insanely skilled and powerful compared to what they used to be
-Think of Madara saying him vs Hashirama changes maps due to their damage of terrain.
2) Less talking.... The original series fight had so much talking during it. Naruto and Sasuke both agreed that they are on a level where they talk with their fists. Their fight WILL BE BETTER if it's a fight and not a debate.
3) The hype. We knew Naruto and Sasuke were going to fight in the original series. But we also knew that they were nothing to fancy.... as in there were so many stronger character than the 2 of them back then.... If Naruto and Sasuke fight @ 100% in the current timeline..... it will be FAR BEYONG A KAGE LEVEL FIGHT.
4) The storyline. Naruto, after all this time, is still pursuing to save his first true best friend and rival. True friendship right there.
5) The end of the series. (@ least from what i've read) This will be the last fight.... expect it to be like the final minutes of a fireworks show compared to the normal show....