JA Shepard wrote...
I think it's very possible that we will see that the Normandy isn't the only ship on that planet. Since Admiral Hackett ordered the fleet to a rendezvous point, there may be other ships that had already safely landed there. It's the easiest and most logical way to say that the crew isn't stranded forever.
I still don't see myself going with destroy, but I can see a way for there to be a reunion with the crew for those who did, assuming that the breath scene was more than just a throw-in Easter egg to begin with. I have my doubts but, it's not like there is no reasonable explanation for the crash cinematic now.
I could maybe see your first argument - but how do we know that Shepard would live to see the day they return? Not only are we unaware of what Earth's state is (and if they have any ships, functional technology, food/ability to grow food, a decent population, etc.), but there's no telling just how far away the Normandy (and others, in this hypothetical situation) is. It may not be possible for them to reach Earth in their own lifetimes (ignoring, maybe, someone like Liara), and I don't know how they'd have enough supplies to make the trek anyhow.
Even if they somehow did make it, it would be a long time later, and I think would somehow not fit the Adam-and-Eve theme quite as much, so I wouldn't expect them to throw that in the extra ten minutes they give us.
But, to be honest, I don't expect them to do something like the idea you suggested. Based on what they've been saying, I expect we'll get the exact same cutscenes we did originally, just with some additional ones thrown in throughout it. Which would mean the poor ol' Normandy crew is properly screwed and isolated on that planet.