Plane down in Hudson River
One aspect I have not seen discussed is the information available from the fuselage structure. My only experience is of old fashioned riveted structures, I have no idea how much of a bus is machined and bonded rather than riveted
This was a near perfect ditching in calm water, the degree of damage to the underside will give a great deal of guidance on the survivability in other circumstances. I would still guess that landing in ocean swells would have lead to less favourable outcomes.