No, I don't think it will change a thing. Interesting some of the comments on here. First of all, Costa is the luxury division of Carnival Cruises. It is the same as Celebrity is the luxury division of Royal Carribbean or Lexus of Toyota. So, yes, it was a major cruise line! And Yes, it was a major cruise ship! She is similiar and a sister ship to the Carnival Splendor.
Second, the legality will depend on whether the ship was in international waters and where the ship was flagged. Both will come into play in a court of law. Interestingly enough, the ship is flagged in Italy so if it happens to be in Italian waters (I'm not sure about this) then same jurisdiction.
Third, do people disapper from cruise ships? Yes - and it is a very easy answer. Either they are pushed or they fall overboard. If you fall too close to the engines or waters that are being propelled towards the back of the ship towards the engines then you become fish food..it is really that simple.
I was hoping that prices would drop so that we can take a cruise!
C.