If they make a sequel where those choices transfer over they either have to pick a canon ending or put in some kind of shallow 30-60 minute prologue where all of those different endings somehow converge so that you can start around the same place.
Two things:
1) All you said apply only if they take same protagonist into sequel ... wich can easily be avoided by, well, simply not do that.
2) 30-60 minute prologue that converge several completely different stories into one starting point, where ACTUAL story of the game begins ... is litteraly my favourite part of Dragon Age: Origins. xD
I dont even know anymore how many times i played those short stories in the beginning, but i completely lost interest when that beautifull political drama turned into "bad army, lead by bad evil dude, kill them all".
