If the truth is being told by the various agencies, after so long, it must be nigh impossible to:
a. keep all those people and their mobile phones quiet,
b. select somewhere to land so remote that no one sees it
c. take an aeroplane load of passengers hostage and not tell anyone.
I hear about satellites pinging, weak radar trails, mobile phone batteries etc but that doesn't really prove anything.
I think Occam's Razor comes into play and that would suggest the wreckage of the aircraft is at the bottom of the sea within a few hundred miles of where it was lost on radar. It just hasn't been found yet.