There hasn't been any statement claiming that Patch 7 is the last time any changes will be made to dialogue or cinematics, so there's always the possibility that more things people want can be added to the game. All we know for certain is we aren't getting brand new stories in either dlc or sequels.
I hope that we get some kind of patch that wholly focuses on finishing and fleshing out exisiting companions that have been neglected and their quests. That would be a dream patch personally. I think it is possible that they could do that, although I would not hope too much. Maybe I'm being too optimistic.
