I'm still wondering how they're going to manage to 'conclude'.
I mean... lets say you finish the 'final boss'. But the servers aren't going down for a few more days, so it can't really be 'the end'. Neither can the current system hold up to an epic all open world boss. really ... Nor could they say it's at this time during these hours because then everyone would log in and crash the servers.

I do think like the INN rooms, we'll be thrown into Cut-scenes when we log in...
But as far as 'concluding'. I don't know.
My best guess is that perhaps after the 'official' end of service they might say, log in any time during the next week to see the 'final scenes', (no playable content), then the game will kick you off and that's it?