I love the 'old-fashioned' heroines in some of the BBC dramas, for instance (North and South and Pride and Prejudice spring to mind).
I also like Buffy the Vampire Slayer – an original character in an original series, and for me by far the best of the 'slayer-type' females. However, such a character has no place in J. R. R. Tolkien's world.
I'm also not sure the marketing twerps are necessarily to blame, or PJ himself for that matter.
The fact is that as far as the other characters in the films are concerned, there was always a bouncing-off point, i.e. Tolkien's work (for which PJ has always professed so much respect). Although there are differences between the characters in the books and films, there is at least some resemblance between them, with which viewers can identify.
However, this 'Tauriel' creature is an entirely new character, not written into the books by the professor, and she is bound to be alien to the world of Middle-Earth – because the script writers will not be able to equal or better Tolkien, or capture the tone of his characterisations. I do sense some arrogance on someone's part in thinking that they can somehow better the story by the introduction of a new character. There is a reason why J. R. R. Tolkien's books have stood the test of time, despite the lack of ridiculous females toting machine-guns and the like.
I trust that, if this character really has to appear, her role will be very small, otherwise she will be a real turn-off for many viewers. And they should stop promoting the woman.
also I would say that the marketing twerps think that an 'old fashioned' heroine who floats around in nice dresses is going to put girls/women off, because women should, according to them, be seen seen as active and as cool as the boys in a fight. I personally think this is twaddle. I actually like the old fashioned females I see in films, their strength comes from courage and loyalty not by splitting lips and kicking people in the head. Thats why Arwen and Galadriel are so well loved by girls/women, they are dainty velvet clad ladies but have inner strength, Arwens love sustained Aragorn Galadriels power sustaining the fertility of a Whole Kingdom. this is the kind of women other women respond to, and it doesnt hurt if they have lovely floaty frocks too.