Aye, the rediscovery of "Saved From The Titanic" would make the news worldwide as well. If someone found that film in their late Uncle Bob's attic and put it up for auction, I reckon you'd get bids of six figures coming in for it. Another new wave of interest from the curious would follow.
I think most of us would still much rather see the film of the Titanic's launch or the early colour film of the Olympic. Imagine the wave of interest that would follow if it was announced to the world that actual moving film of the Titanic being launched had been re-discovered.