So it's probably a long shot, but what if Amara's "giving Dean what he wanted" was actually peace? Maybe, once God pulled the souls out of Dean, he ended up dying anyway, albeit without the massive explosion. Dean didn't know it, of course, questioning why/how he suddenly ended up in a wooded area, with his dead mother calling for "help" nearby. As for Sam, maybe the Men...er...Woman of Letters really did end up shooting him, and the entirety of next season will be him and Dean thinking everything is okay as usual, tying up any loose ends they have/making peace with it all before the Reaper ends up claiming their souls at the end of the season, forcing the brothers to move on (and effectively ending the show). The Reaper's comment about Dean seeing her real soon, could possibly have been a hint?
I don't know, the finale seemed strange to me, something definitely different than what I'm used to. I didn't dislike it at all (I enjoyed it), just not what I expected.