What IF?

Regarding the Malaysian flight missing with 239 people on board. I was thinking today what is it that we actually know about this flight. First, we know 2 people had stolen passports. 2nd we know that the plane had 7 hours of fuel on board. 3rd we know it had been damaged and repaired when I wing hit another plane in Shanghai at some point.

So, knowing these things along with the fact that it went off the radar let's think about what could have happened:

1st (and most unlikely) the plane was targeted by hijackers, the pilot, co-pilot and passengers and crew might have been overcome either with explosive decompression or some kind of gas put into the plane that would dissipate after everyone was dead on board (except for those with gas masks). Then the hijackers flew the plane (7 hours) to Syria, North Korea, or any other destination they could make it to within 7 hours flying time.

What would they want this plane for? Almost anything from shuttling terrorists to some location. Using the plane as a nuclear bomb or missile after changing the call signs of the plane to another likely fake or genuine call sign for another plane of the same size.

2nd (and most likely) would be either the damaged wing was more damaged up against the fuselage when the wing tip was damaged and these hairline fractures were not found because of their location near the fuel tanks until they gave way.

3rd. Some other kind of catastrophic event occurred that no one expected like running into a private jet that was not registered because of criminal activities. (remember this plane disappeared at night and such a plane might not be flying according to flight rules or with a licensed pilot on board.(the other hypothetical plane).

4th- maybe the air pitots froze over with freezing moisture like happened in the Air France from Brazil to Paris which then through off the autopilot's reading and didn't register a stall warning because of frozen air speed  pitots outside on  leading edges of the wings which was what caused the Air France plane to crash in the Atlantic Ocean several years ago now when it went into a partial or full stall and no one noticed it on automatic pilot.

Or what do you think that happened? One of us has to come up with what actually happened. And because of this one of us likely will help find the plane wherever it is (in a landing field somewhere or under the ocean or crashed on land somewhere. Are all these people still alive like in an episode of Lost or something?