I agree, though the topic started with adverse weather scenario, and this is the place where this basket won't work, and unfortunately most maritime rescue situations are in adverse weather.
I'm all for having those devices stored on board of rescue vessels, to be used when possible, but I believe, adverse weather is not that time, and needs different approach. Unfortunately multiple hoists on one aircraft also won't work in those situations.
I believe that having many aircrafts with enough fuel to stay till full is the right approach to low-medium number of casualties, and having rescue vessels working in cooperation with helicopters (that can take seriously injured on shore fast) is the way to go with the big numbers.
Again: I'm not bashing that idea, I'm always talking about adverse weather operations (a.k.a. high sees, storms and hurricanes).