I don't think the search will be called off entirely for a very long time. But in the next month or three most of the countries involved will withdraw their search craft. H.
The problem we have with this incident is that there are simply
too many unknowns.
Are this juncture we don't even know if the plane crashed. It could have been commandeered, flown to some spot in central Asia, and be hidden under camouflage netting.
If, on the other hand, the plane crashed into the sea - either the southern Indian Ocean (as the searchers now seem to think) or some other chunk of saltwater closer to its planned flightpath - sooner or later some identifiable debris will show up somewhere.
It simply isn't possible for an aircraft that large to crash into the ocean without breaking up. And there are a lot of things on an aircraft that float. Seat cushions, insulation, passenger luggage, etc. etc. Even if the plane corkscrewed into the most inaccessible part of the Southern Ocean, sooner or later ocean currents and winds are going to deposit an identifiable piece of debris on a beach or rock, someone is going to find it, and then - for better or worse - family members might begin to have some closure.
If and when debris is recovered, flight safety investigators are going to have some additional information on which they can base their further searches. Smoke or fire damage on the debris would offer additional clues, as would residue from explosives.
But if, for example, six months from now an identifiable piece of wreckage washes up on the coast of Peru or South Africa, what does that tell us? Not much, I'm afraid, at least when it comes to the final resting place of MA 370.