> Amazon has called season 6 the final season, but they also included a bunch of stuff from Laconia which didn't even appear in the main book series (it's from one of the Novellas), which in my mind only makes sense to include if we are going to get the final trilogy at some point.

Yeah, what I think happened is they saw a nature ending point for the TV Show and decided to finish the story they were telling there. The Laconia bits were put in as a sorta back-door micro pilot to a new series that they had not fleshed out yet. Book readers don't really internalize that the first six books and the last three are different thematically and tonally. I think they are just developing a new series to handle the Laconia period of the story.