Down With Arwen!
Jose Van der H.

If there is a God out there (or an Eru) :please let the screenplaywriters and director see the Truth in these articles.

Stephanie C. and Mark S. have pointed out already some interesting objections to the role that Arwen is supposed to be playing as an active member of the Fellowship.

To those I'd like to add another one (assuming someone else hasn't already mentioned it) : Arwen's destiny has nothing in common with that of the other members of the Fellowship. Both the Elves ànd the Wizzards know that the upcoming conflict will be the last great one for the Elves : the end of this Aera will be the "end" for the Elves (either to diminish strongly or disappear to the West). It's no coincidence that in the Fellowship there are no "real" Elves, except Legolas, who belongs to a branch of the Elves that are already considered as being "less" than the other Eldar. To put it more "rudely" (for Elves anyway) : the people of king Thranduil of Mirkwood seem terribly close to mortal mankind.

The outcome of the war - the destruction of the Ring - will lead all free people to a new (maybe higher) state in Middle Earth, the Elves and their pre-Ring power must disappear. The Hobbits will be drawn out of their previous obscure existence, the Dwarves will grow in number and importance, and Mortals will become the leading people - even the "ruder" Elves of Mirkwood are allowed to cast off their reputation of being unhospitable and unsophisticated "under-Elves".

The fact that Arwen chooses to remain in Middle-Earth is hardly something to rejoice in : she must lose immortality and  consequence from being one of the (High) Elves. She only gains a limited number of mortal years with a man who dies even before her.