"This Is The Most Plausible Theory For The Plane's Disappearance We've Heard Yet . . ."
All the conspiracy theories are worth considering, but I don't think they're the way to bet.
See also "Remote Islanders In The Indian Ocean Claim They Saw The Missing Malaysia Plane". I put very little stock in the supposed eyewitness testimony, but it is interesting that the island is in the general area of the plane's last apparent heading.