Oh, I see now.

No, I don't think a continuation of the story line is necessary, or even desirable. I like what Adam Smith had to say about how the events of the Bhaalspawn saga will shape the history and politics of Faerun. In this, I can understand to a degree that this game is a sequel, just not in the traditional sense. I can relate to the people saying "what about renaming it to BG: Something Something?" I think that is a good solution for two reasons: 1) it makes everyone happy for not a ton of money in the grand scheme, 2) it leaves the door open for a proper, traditional sequel with an RTwP style - either way, it marks this new game as something new and unique, which I think we all can agree that it is.