what will we learn from finding MH370?
Let's say the next search is successful and for some n million $ we get a look at the wreckage and even retrieve the black boxes.
With the (reasonable) scenario most lately discussed we aren't going to find an intact airplane, but rather a whole bunch of bits widely scattered, except a lot of them will be held together by wiring etc. No hope of recovering bodies at this point, at least not for autopsy.
While it is possible the CVR might have comments made in the last hour, but even that seems unlikely. FDR will tell you it ran out of fuel, when, and maybe some info on the descent, but nothing about WHY unless it captured some sort of failure, but this airplane appears to have been mechanically fine.
So what if anything is gained by finding the bits, except perhaps a sense of finishing the job?