"We will not meet again, Elessar"

[Knight of Gondor]

Originally Posted by Eruanna

I think it was added simply to give the audience (those that hadn't read the books) the idea that perhaps Aragorn might not survive the coming events. Galadriel's very definite 'We shall not meet again', coupled with the earlier scenes of the mirror etc cause a sense of doubt in the viewer.
That way, when he goes over the cliff edge with the warg they think that he just might possibly actually be dead.
I remember when I saw the films for the first time, although I enjoyed the spectacle of the battles, there was no sense of real danger for Aragorn, as I knew he survived.

I don't think anyone, even the uninitiated, seriously believed Aragorn died at that moment.