Re: 5x08 The Hungry Earth (Grading/Discussion) SPOILERS!!
I really can't see it - partly because it robs the appearance of River Song of meaning and partly because it's simply lame to have a series conclusion that is "and it was all a dream".
If nothing else, I think we're setting up for another "Timelord Victorious" moment towards then end, where the doctor goes back and changes history to get the outcome he wants.
- SeerSGB -
Good men don't need rules, The Doctor (A Good Man Goes To War)