BD-Legolas raises interesting points in terms of Arwen's existence after Aragorn's death.
I think in the Books there is no doubt of it lasting only about a year or so. But the Film isn't off base in that that was not necessarily predictable at any time. Still, it does not seem defensible that she would live as long as Elros, having already been around for 3,000 years.
Given the obvious potential (even as I believe otherwise) that Elladan and Elrohir could have joined their father later, I believe that the length of time, in which they could choose, would be relatively short, in all likelihood: a normal adult life span. After this, it would be too late, and they would probably live only for another adult life span, or the roughly 120 years that Arwen and Aragorn had together.
In Arwen's case the choice was permanent from the time she married a Mortal, and everyone knew. I believe Aragorn's dying utterance to the apparent contrary reflect one or two things, which show him to not be absulutely perfect: (1) He's guilty to have brought her to that point, and taste the true bitterness of mortality: the loss of those we love, and (2) He is ignobly testing her love.
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The hoes unrecked in the fields were flung, __ and fallen ladders in the long grass lay __ of the lush orchards; every tree there turned __ its tangled head and eyed them secretly, __ and the ears listened of the nodding grasses; __ though noontide glowed on land and leaf, __ their limbs were chilled.
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