I may be overly naive, but I reckon that ANY yottie would note, investigate and report spotting a "low floating" hull
at sea, and have a skiz at a wreck on the beach. I know that I would.
But yeah, six months is pushing the survival envelope out to the unbelievable for me. There will always be the possibility of spotting debris, though.
The families involved are deserving of sympathy, but pouring more money
into searching (especially by firms that seem to charge VERY dearly for their services) is of doubtful use.
A sad story indeed, but one that seems to be over for all practical purposes.
PS Perhaps they should add some data from Roswell, New Mexico
into their "Fact, not Fiction" files...