Yeah, I am kind of done with the Bhaalspawn thing. It would be fine in terms of background setting of course, but going forward I would prefer something else. The actual theme of the Baldur's Gate series relates to the main PC being a rare case for whom the "coin of fate" has landed on its edge. This theme comes up in many subtle places throughout the game (Jaheira dialog, Portabellarwinden, various astrologers, etc.) but it is prevalent and it beautifully culminates at the very end of Throne of Bhaal. The "coin on edge" should carry into BG III to maintain its spiritual succession to the series.
What else did Aluando the Wise prophesize about ... there must be something else going on in the universe, no?