Everything in TV land gets shaped by the on going feedback of fans. Which cast members return, who gets more screen time, etc.
Just recently, the G. I. Joe 2 movie producers revealed that based on early screening feedback, they added more scenes with one of the actors who was also in Jump Street 21 because his popularity increased.
Game development throughout development gets focus groups, internal team opinions, etc.
Every form of art is highly reliant on feedback and most of it evolves before it is considered done.
Music gets remixed, movies get director and special edition cuts or edited for TV, and games get patches, DLC, and other post-release modifications.
I don't see Bioware expanding on the ending of Mass Effect 3 as a big deal. I don't see it as a big deal if some fans were to create some endings of their own. It doesn't matter. It's just a game...
Artistic integrity is a mythical concept
