User blog comment:James12708/Bioware Hasn't written themselves into a corner/@comment-4950455-20121109062047/@comment-4237253-20121109082941

I wrote a blog on this awhile back. Since we know BioWare can't handle the far-reaching effects of the four endings (hell, all of the species die in one ending!), their choices are thus: retcon, thus invalidating the player's choice, or invalidate our choice less directly by thinking of some contrived excuse.

Either way, there's no reason to continue cashing in on the Mass Effect franchise unless they had a solid plan from the start. I believe it's always better to have a plan from the get-go; you should develop a story arc with a beginning, middle, and end in mind. Once the story has run its course, leave it be, and move on. Take what you've learned from this story and weave it into the next. They can create an entirely new IP, with a new universe, they just have to use their creativity.