Poor Neville. He's already got so many different purposes to fulfil - what with the tortured parents, the witnessing of death, the possibly-having-his-memory-erased theory, the prophecy, the braver-than-he-seems thing... Don't make him a medium on top of everything. Parvati will do just fine. And she can talk to dead!Sirius just as well. She might even be more willing, as he was handsome, and Parvati, bless her girly heart, likes handsome.

I am very pleased to see that there are still many people in the fandom who haven't adapted the image of Thewlis' Lupin as the real Lupin. It seems to me as though fandom has been flooded by moustached, scarred, cardigan-wearing Remuses since the release of the film. Lupin is thin and wears robes. Yes.

I think people "become" Seers as they have their talents discovered and developed. Parvati (and it'll be Parvati for me unless Rowling tells me it's really Neville) has the "makings of a true Seer", but she needs help and tutoring to become a fully-fledged Seer. And I'm not sure Trelawney is the right person to offer the necessary tutoring.

On the other hand, Trelawney might be a failure herself, but she might have the theoretical know-how and be able to help Parvati develop her abilities. Who knows?