I'm just curious about the 2.4 narrative. Either the Thargoids continue to pose a threat, or they don't. If the latter, then those weapons are of limited use (unless they can be used, and are effective against, other players).
But those features aren't narrative-driven, with players deciding how their existence plays out.
Given Elite's nature this Thargoid gameplay will have to be present in the game for the long run, i.o.w. permanently.
This is not a limited time action game in which a player is the hero and saves the universe and gets the girl in the end.
I expect the Thargoid presence to be influenceable by players in certain areas.
Most likely for the long run (the rest of the ED's existence) there will be areas where the chances of encountering Thargoid based gameplay mechanics increases, with areas of varying degrees of difficulty and there will be permanent, unchangeable Thargoid space with Thargoid home planets and planetary and space based constructions.
This is the only way to do it for a open ended game like ED. Players will need to have permanent access to this new content.