The international effort to locate what, at this point, is almost certainly the wreckage of Air Malaysia Flight 370, is massive and ongoing. Through sheer manpower and man hours of work, this flight will be located. The passengers will be found, however it is extremely unlikely that there are any survivors.
The Pacific Ocean is a big place. Sadly, I think that the missing plane is on the botton of the ocean. I think that because of the vastness of the ocean it may take some time before the plane is discovered. It is impossible for a plane to disappear, certainly for a plane of this size.
No, we will not find the passengers from the missing Malaysia Flight 370, because they are already gone. Whomever wanted to take that plane wanted those people destroyed. They are already long gone by now, so they cannot say what happened. This was all carefully planned. It is so sad for the family.
We will not find the passengers from the missing Malaysia flight unless they have landed somewhere remote and manage to escape. However, the likely scenario is that the plane is at the bottom of the ocean and will never be found or at least the bodies of the passengers will not be.