If I remember correctly, the writers ditched the whole Arnor as a Northern Kingdom of the Dunedain in Middle-earth, along with their struggle with Angband and the Witch-king and Shire being a part of the ancient Kingdom and still under protection of the Rangers (the remnants of the Dunedain in the North). I think Butterbur mentions Aragorn as being one of the Rangers but I don't remember if it ever comes to play in any significant way. I suppose PJ decided this would be too confusing for those who haven't read the books and perhaps he was right. Still, it's a pity as hobbits receiving the blades of the long-gone people they had been the vassals of and Merry finally helping to bring that struggle to conclusion (as well as avenge the death of Theoden, his other liege) is one of the neatest plots threads in Tolkien's books.
As for the Silmarillion, I don't see how it can be filmed successfully as even relatively self-contained stories like Beren & Luthien and Turin still depend on a lot of background knowledge and everyone seems to be afraid of exposition these days. Multi-season TV shows (HBO/Amazon/Netflix style) seem like a more reasonable approach but it's still going to be hardly problematic with the multitude of cast, the great passage of time and not clear protagonists. The Silmarillion relies on the reader's imagination even more than LOTR and a lot of its mythic power can be lost with a too literal interpretation (which is why I'd rather PJ stayed away from it - he just doesn't know what subtlety is). On top of that, a lot of events are described rather briefly and even with Unfinished Tales and HOME available they'll still require some fleshing out. In other words, I don't envy anyone who'll have to tackle this mammoth task if it ever happens (it might if Christopher's successors have a different opinion on the visual media).