In the December 2007 edition of Practical Boat Owner, the editor Sarah Norbury extolls the virtues of Coppercoat after a 14-year test on her family boat, a Starlight 39. She writes: "Our experience with Coppercoat has been fantastic. In all the 14 years we've never had a barnacle, seaweed, nothing.... The original claim for our Coppercoat was that it would last 10 years and many people were sceptical. Our test proves the doubters wrong."
I guess good news travels slowly.
either they obtain a separate license from each of the original programmers
This option is actually not available to Cisco, as almost all of the original authors (including me) have assigned their copyright to the FSF. Thus, we can't re-assign it to some other party after the fact. Some may have made their contributions public domain so they could be used, although I'd expect this to be a rare case.