Seems like Bioware is going to take to summer on this thing not to create good alternative endings, but to try to write their way out of the hole Casey Hudson created. I do not envy them having to take the time to make sense of this shit. I hate how defensive the whole "not going to change the ending" thing is.
First of all, it was two guys. Not the team. Two guys. There's no reason to defend their shit.
Secondly, they don't have to scrap those endings. Those can still be there. Just give the players other alternatives to the red-blue-green choice, stuff outside of that. How can more options be considered a bad thing?
Do they not understand that part of why people are pissed is that their actions and choices don't affect the ending situation? Partly because it was promised and partly because to do it this way, the ending has nothing to do with the rest of the game. I'm avoiding every scene and spoiler for earlier in the trilogy that I can, but I don't mind knowing this ending so well because it's detached from all those other actions and character moments. It's just slapped onto the tail end of everything.