Obito will never be the final villain, he is OP as *uck and all but he will not be the final villain ! it's too early for this Manga to end, and not because I want it to be too long, it's because Kishi still got too many things he didn't showed us and Orochimaru planning something for sure !

I'm telling you Orochimaru will get Sharingan and Sage Mode and some other crazy power ups and he will be the final villain, it's just too wierd that he acts somewhat "good" now, he is surely got some plans, also A lot of people thinks that Obito will not remain as the last villain, and Obito is my favorite so it's not that I hate him or something

Sharingan+Sennin Mode+Mokuton+another power up, those are the power ups Orochimaru will have in the end...