Peter Jackson to film "Lord of the Rings Sequels"

[Dark Lord]

I would dispute this. I don't think Tolkien ever considered or wanted the history of Arda to continue beyond the Fall of Sauron - that's exactly why he stopped writing "The New Shadow". Without 'incarnate evil' there was nothing left to write about. Fictional history became real history.

Dagor Dagorath? That is a prophecy, even though it may not be clear, but it still was written.

Even if they did just make one up (which I imagine could put them in a dubious legal position), why would anyone want it if it wasn't based on Professor Tolkien's own work? What would be the point?

Simple. Money hungry companies don't really care if it was written by a the best author and if they destroy it's lore.