I think the final altitude of 0ft on FR24 is not correct. It means the aircraft would have had to transmit this altitude and an ADS-B receiver would have had to receive it. But as you know the distance over which ADS-B signals can be received depend on line-of-sight connection and at 0ft this line of sight is not really long.
If this incident was similar to AF447 and the plane would have dropped, it would still have transmitted ADS-B messages that show a change in speed or altitude. So this seems very unlikely to me.
The only two reasons I can think of that cause a plane to not transmit any more signals are that the transponder has been switched off intentionally or an explosion that destroyed at least the transponder and maybe the entire plane.
The latest reports that the aircraft might have turned after it stopped reporting its position may indicate an intentionally switched off transponder, maybe by a hijacker.
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