I confess I’m actually looking forward to the dialogue in ROP.
I think we process conversation differently when we hear it compared to when we read it. Tolkien’s dialogues are brilliant, of-course. However, if the writers tried to emulate his written dialogue too closely, in particular with respect to long, complex sentences, it might be perceived as staid or even pretentious. It may be better to keep the structure more akin to the modern-day speech, but to elevate the style. We’ve heard very little so far. But take this, for example (exaggerated) -
Elrond could have said to Galadriel:
”Try & relax, would you dear? You’ve done plenty. Go have a bit of fun now!”
instead he says:
”You have fought long enough, Galadriel. Put up your sword.” - this I think is beautifully (and simply) written & masterfully delivered by the actor.
Likewise, Gil-galad could have said:
“I have a bad feeling about this!”
instead he says:
“Darkness will March over the face of the earth; it will be the end not just of our people but of all peoples.”
And there’s Galadriel’s introduction to the main trailer - “We thought the war, at last, was ended. We thought our joys would be unending. We thought our light would never dim.” - iambic tetrameter, as pointed out by prof Olsen - Tolkien’s favorite poetic meter.
You guys are the experts at this though. This is just how it comes across to me as a casual observer.