OK, the last I heard it was confirmed that someone acted with deliberation when they turned of all the electronic tracking systems they could.
I also read that there had been 20 electronic warfare specialists on board.... ergo folk who know how to crash whole countries web servers, not just planes.
My best guess... a superpower (USA ?) saw that a large number of 'dangerous' assets were moving towards another superpowers capital (China) and either saw a unique advantage to grab their 'home' team, or at least 'disappear' them.
There are countless spy sats overviewing that area constantly, by now (and within hours maximum) they (the spooks) would have plotted and followed the course the jet took and know where it was landed.
The inefficiency of the Malay government, whether deliberate of not, tied with the misinformation package sold to the media, ensured that whoever took the plane had time to achieve their objective, which I suspect was taking the experts not just killing them, if it were killing they would have done it in a 'terrorist' attack, and maybe the 'false flag' unaccounted passport holders were assets in place in case they needed to terminate the plane rather than steal it.
In any case I imagine the innocent passengers will never be seen again, or they could be found in the jungle somewhere.... it's possible that in the stealth flight time the plane landed at a CIA airstrip and downloaded the 'cargoe' before being re flown to a deepwater grave we may never find... heck they may have just taken the 'black box' and dropped that in a really deep hole in the ocean.
Anyhow, just a guess, I would have no way of knowing that, and could not possibly comment on it! :)