If you read through the speculation, you'll see the comparison to Broken Steel is more appropriate than you might think.
Nobody - or at least very few people - are asking for a total rewrite of the endings. Their desires range from a bit of an explanation of just what the hell happened, others for more options. I'd like to see the, ah, actual ending. I find the evidence that the time from the moment you're hit by the Reaper death ray to the end is all a hallucination to be quite compelling. I will make a rough outline of why I think that's the case now.
1) When you wake up, everything appears dreamlike. You're alone. You can hear them talk about how the ground team was wiped out and they're pulling back ...
2) ... in spite of which Anderson says they followed you inside...
3) ... Into an unknown part of the Citadel that seems to defy all logic. Anderson suggests that the place is "changing", but it doesn't explain how he got there long before you, how the Illusive Man appears to be controlling him ... or for that matter what the Illusive Man is doing there at all. I mean, the more you think about it, the less sense it makes. The Illusive Man is indoctrinated by the Reapers, who are the creations of the god child, who ... sees the Reapers no longer work, and ... wants the cycle to end. Why couldn't the Illusive Man end the cycle? Why would they need Shepard to go there and do it for them? Unless the child doesn't control the Reapers, and ... ugh, it hurts my head just thinking about how little sense it makes. But there's more!
4) All along, you've been fighting the Reapers, and it's well established that they're an insidious force, capable of getting in your head without you even realizing until it's too late. Could that explain why the choices all seem ... wrong? Anderson encourages you to destroy the Reapers, the Illusive Man to control them. The kid goes out of his way to make destruction seem like a bad choice. It doesn't seem like a typical renegade choice, and yet it clearly is.
EDIT 4.2) I neglected to mention the oily shadows slithering around the screen during your conversation with the Illusive Man.
5) If you pick either Control or Synthesis, you die. If you pick Destroy, you get the hidden ending, with Shepard lying in a pile of rubble, apparently dead, before taking one deep breath. This, it seems to me, at least heavily suggests that the kid is trying to convince you to go with Control or Synthesis because it represents giving up. Through destroying the Reapers - metaphorically or literally - you break free of their hold, you wake up where the hallucination began, in a pile of rubble, in London.
I'm probably leaving out important things here, but the weight of the evidence seems clear. There's a very good video on youtube explaining it in deep detail too, especially elaborating on how everything seems ... backwards.
Now, it's entirely possible BioWare just wrote themselves into a corner here. It's possible they didn't intend for this, but you have to admit the evidence certainly suggests it.
I don't see how releasing a game where the ending is left out is a sound strategy, but ... it presents them with a very viable way of making it seem that way without having to actually retcon anything. I recognize that "it was all a dream" is a pretty lame device, but it's miles better than ... well, whatever it is we got, which just makes no goddamn sense. And dooms the galaxy to a slow death.