Seriously though, I think this whole thing is absolutely fascinating and TBH, I'm kinda looking forward to the Air Crash Investigations show they do on it. I have no real theory about it really. The plane could be anywhere. Re the black boxes, they would be transmitting, but you have to be near the plane to be able to detect it I would have thought. I do hope that because they haven't found anything yet, that there is a tiny, tiny chance of them being found OK.
I agree, I was talking about it with DH - about how it is possible to lose something the size of a plane, he was saying he had watched some show about aeroplanes disappearing in the Bermuda Triangle, and apparently there is to do with a fault line in the earths crust where some gas bubbles up and causes all debris and whole planes to sink rapidly and be drawn into the fault line itself, and therefore never ever be discovered. Is called the Methane Bubbling effect apparently and on a site I was looking at it also said

"And if some really large bubbles of methane gas were to rise in the atmosphere and then get sucked into the engines of a jet, they could make a nasty explosion"

So Methane Bubbles causing the plane to crash and then sinking/disappearing the debris - is my theory. (Would think the area round there must have a few fault lines, underground volcanoes etc?)