I am also more inclined to that theory. However, the more time elapsed without a trace of them, the more I believe the airliner crashed in the ocean. I can't imagine that number of people being held hostage for this long without a trail. Also, if the plane had crashed on the land, there would have been fire and it would have been detected.
The latest on the search is the spotting of some objects by Australia through satellite which are likely from the plane.http://www.bbc.com/news/magazine-26609687
I pray it all comes to an end soon so that the affected families could at least know what had really become of their loved ones.