By not choosing a canon ending Bioware really dug themselves into a hole, maybe not at present or even the near future.
If mass effect continues and beyond this new game/trilogy, are they just going to keep ignoring the Milky Way? or are they hoping by that time everyone will have forgotten about it.
On topic, there is only one ending: Destroy.
IT would have been brilliant + Destroy, if the game was built around it, Liara and several other NPC always remarked throughout the game how Shepard's will is remarkable so it would have made sense he would be able to overcome it, and they could have easily adjusted for it in ME3 but like NextArishok308 said they had a get out of jail free card and failed to take advantage, fear of choosing an ending? artistic integrity perhaps..
I honestly think IT would have made the game "more", you know? ME trilogy was awesome but it could have been even greater attracting even a broader range of sci-fi fans, or at least being applauded for its brilliance, or not, but that's just my opinion.
Either way all we got was an epic fail Deus ex knockoff ending (discounting destroy
).