I would hold off on this, for a couple of reasons. First, we're not sure where it's going to lead, going back to earlier seasons there seemed to have been many pointless scenes, in hindsight though nearly all of them were significant at some point in time.
The scene with Quaithe seemed pointless for a few seasons until Jorah got greyscale, right?
Also, think about when Bran was Lord of WF for a while with Maester Lewin by his side, he had people come up to him with questions, concerns etc...That's what this was here, it wasn't a mass meeting of Lords, it was people coming to speak to Sansa about something or the other. It's why Lyanna wasn't there, also, because they're clearly conspiring with LF, or being influenced by him, or, just seeking his counsel. Lyanna should really have nothing to do with this scene and having her there would be stupid, why would she spend her days sitting in the WF hall when she's got her own home to take care of?
I say, until there's a conclusion you should stop over thinking it.