I've seen this line of thought so many times. What about all the talk of a final Apocalypse and the End of Days before this? The battle against evil had never been suggested to be neverending until this point.
- Never suggested until that point? The battle against evil being never ending was clearly stated in SEASON 2, in the episode 'Epiphany':
Angel: "In the greater scheme or the big picture, nothing we do matters. There's no grand plan, no big win. ...If there is no great glorious end to all this, if - nothing we do matters, then all that matters is what we do. 'cause that's all there is. What we do, now, today... Because, if there is no bigger meaning, then the smallest act of kindness - is the greatest thing in the world."
Faith: "I did my time."
Angel: "Our time is never up, Faith."
- How about this one? When the Shanshu Prophecy is first discovered, it's mentioned no one knows which side Angel will fight for at the apocalypse? That's because it doesn't matter which side he'd on. Angel's big importance will be triggering it. In season 1 of Buffy, he delivered the Codex to Giles which led to the prophecy of Buffy's death. In season 2, Angelus opened Acathla, a potential apocalypse without a ton of demon fighting. In season 4 of Angel, his actions made Jasmine's existence possible and in season 5, his actions allowed the Circle of the Black Thorn's army to appear in the real world.