Parmandur
Book-Friend, he/him
I think 5 seasons would do the trick. Keep the scouring as a big Series finale to show how the Hobbits have changed and grown.I'd be interested in that in theory. But it really depends upon how it was done, and who was doing it. Book-to-film adaptations run the gamut from really good (GoT) to pretty good (LotR) to fairly awful (RoP)...all imo, of course.
But yeah, imagine Lord of the Rings spread out over six seasons, one for each book:
Season 1: The Ring Sets Out - from Hobbiton to Rivendell.
Season 2: The Ring Goes South - from Rivendell to Amon Hen, and the breaking of the Fellowship.
Season 3: The Treason of Isengard - Saruman, Rohan, and Helm's Deep.
Season 4: The Ring Goes East - Frodo and Sam heading towards Mordor, Ithilen, Shelob.
Season 5: The War of the Ring - Gondor, Paths of the Dead, Battle of the Morannon.
Season 6: The End of the Third Age - Mordor, crowning of Aragorn, Scouring of the Shire, Grey Havens.
I think seasons (and books) 3 and 4 would have to be done mixed together and chronologically like the films, otherwise you might not see certain characters for an entire season. I'm also somewhat dubious about the idea of including the Scouring of the Shire, as it could be rather anticlimatic in a "dead cat bounce" sort of way, yet on the other hand gives the hobbits a nice victory to end on.
But you'd essentially be turning 11-12 hours of film (the extended versions) into 50-60 hours, depending on whether each season is 8 or 10 episodes.
Alternately, you could add a season and make it seven, with the first being precursors - stuff that was included in Jackson's Hobbit films, Dol Guldur, and maybe a young Aragorn. So extending the total run-time to up to 70 hours.
Another option would be to use a good portion of those 50-70 hours on creating new stories and characters in different parts of the world - perhaps a failed Harad revolt, orcs invading Lake-town and the Lonely Mountain (get more dwarves in there), Rhun and the east (and the Blue Wizards), etc. Meaning, it is implied that the conflict with Sauron went beyond the events of LotR--that what was depicted was the central focus, but Sauron's influence was much more widespread, so it could be interesting to see "everything else."
I always thought Robin Williams would have made a good Tom Bombadil. But his exclusion from the Jackson films didn't bother me; it felt like a quintessential Tolkienism that would have been very hard to portray on film. The point, I think, of Bombadil is to be a mystery and anomaly, who in a way gives a completely outsider, even quasi-Taoist, perspective on the who drama. That isn't impossible to portray on film, but it would be hard to get just right.
The extra run time would allow time for all the songs from the book, which are literally one of the most important features, and allow the characto get drawn out without being overly broad in depiction.