I haven't even heard it, but I think it's on crack. Any variation of Not-Dumbledore cheapens the emotional impact of the ending.
I do, however, quite like the idea that Snape made an Unbreakable Vow to Dumbledore. And I'm certainly on the Dumbledore may return/Snape was being loyal theory. For the first, well, there's just way the hell too much phoenix imagery associated with that man for me to believe that he's really dead. And for the second... there was never a satisfying explanation for Snape's "betrayal". If Snape really did turn to the Dark Side and that's the end of it, it was about the least dramatically compelling choice I've ever seen. I can't believe J.K. would muff that up so badly.
I do, however, quite like the idea that Snape made an Unbreakable Vow to Dumbledore. And I'm certainly on the Dumbledore may return/Snape was being loyal theory. For the first, well, there's just way the hell too much phoenix imagery associated with that man for me to believe that he's really dead. And for the second... there was never a satisfying explanation for Snape's "betrayal". If Snape really did turn to the Dark Side and that's the end of it, it was about the least dramatically compelling choice I've ever seen. I can't believe J.K. would muff that up so badly.