Ok, just cos I can, I'm gonna put in a few things here, before giving a serious suggestion to how it should end.
Why you should hate Narutards, but not the actual anime:
1. The author didn't know this would happen, and comon people, if you had the chance to make a multi-billion dollar series and milk it for all the money you could (considering he gets a significantly smaller amount than American comic writers or the average author does for his work) you would too, would you not?
2. They just keep going on and on about the ANIME. The anime is what is the real hate for me, the manga is great, none of this never-ending filler crap. Only around 130 episodes of the 220 in that first series are actually related to the storyline, and of the 99 in Shippuden, at least half are filler. Hate the anime and it's spawn, not the manga.
Reasons to love the anime for spawning the fangirls:
1. All you have to do is cosplay and go to a con and you've got multiple offers of sexual activities right there.
Yeah, yeah that's all I need to say on that one...
How it should end:
Pain battle ends. Flash forward a few more years as Sasuke prepares to wipe Konoha from the face of the planet. Lots of people die.
Sakura comes on to Naruto. Him being the idiot he is, he forgets that she's just looking for someone to love her till Sasuke comes back and then she'll abandon him like he never existed. Sasuke launches his attack on Konoha. Naruto kills him off, but Sakura is heart-broken (again... eugh)and Naruto finally shows some brains, ditches her and goes after Hinata. He becomes Hokage, Sakura marries Rock Lee cos he'll never grow a brain (I'm being hopeful for Naruto here) and then the series ENDS.