No sh*t.
Hes the rival of the main character. Ofc hes gonna play a big part.
Im still going with the theory that he plans to create a new shinobi system after destroying everything connected with the original one.
It looks like he wants to destroy the Juubi so that the Tailed Beasts can't be used for war anymore, which makes sense, since the Nine Tails Incident lead to the Uchiha becoming segregated.
Naruto wants to teach the world that the Tailed Beasts are more than tools for war and the people who host them should be admired, not shunned. Like he was.
I can't predict what will happen but these statements are backed up by previous events and would certainly make sense.
As far as I know , I can say that KISHI created this Rival ,SASUKE just for name sake . But, later this guy turned out 2 b a great lover of SASUKE's character......thus he may end up something like SASUKE awakening RINNEGAN ...& even more ridiculous like he sealing away the JUBBI....., waaadooooou guys say