One word: Lost.

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.
It's always the damn pitot tubes...

I am finding the whole thing very interesting, from an academic POV. I choose not to think about it emotionally, otherwise I would never get on a plane again, or put my daughter on one unaccompanied to visit her father.