BTW...
I'm on the side of: sudden decompression > pilot incapacitation while implementing descent/turnback > airplane flies on a/p until fuel starvation (i.e. the Payne Stewart scenario).
But the longer we go without finding debris, the more alternatives have to be considered.
I also agree completely that the authorities would be better served by releasing more factual information like fuel on board at departure, whether ACARS messages were logged, etc. But believe Hanlon's Razor is most useful to explain why they haven't.