Indeed, Dragon Age's choice lines structure was very original, but devs themselves struggled to keep up with the lines they provided. Of course we wanna follow the lore on the lines we chose, and play it fully, not see these lines turned into small side quests.
As I've read, Tevinter Imperium's blood mages had 7 gods, and 4 of them already became archdemons up till DAO. And the same mages are the ones that tainted Golden City into Black City and were turned darkspawn. I don't believe they created lore this way as coincidence. Now, one of these gods was encarnated into Morrigan's son.
I have seen no explanation on how those gods became archdemons and encarnated into dragons to lead the darkspawn, and IDK what Morrigan's son would become. But for sure I don't want a side quest out of it.
I'm playing Awakening and gonna take a while till I play DA2, I don't think I'll have the time to pay DAI this year. Let's see what I'll face.
But, BTW, I'm really liking how some of the past history is told with incredibility. Does the Maker exists or is just a fairy tale, did Andraste really talked to him or was she crazy? The are lines where we RP ridicularizing the Chantry, and there are other religions. Curiously, the Gray Wardens, who fight the tainted Tevinter's blood mages, isn't directly against blood magic.
Some of these tales proved true, as Andraste's Ashes really existing and having powerful healing powers. So, if her ashes have power, could she really had found the Maker? And could have the Maker tainted the blood mages? So where is the Maker after all?