While I don't much care about the yachts and find the fact that the behaviour is spreading fascinating, my fear out of all this is people will start hurting the whales to try to get them to stop.
I feel bad for the animals, but sailing doesn't seem to be going anywhere as a global interest and boats produced are getting to be more and more fragile in the search for performance. I imagine that it's only a matter of time until there will be a violent reaction when a crew feels that they're in mortal danger -- all I can hope for is that it produces a recognition of danger that also sweeps through the Orca community as a trend and they start to avoid yachts for the sake of both parties.
When I watch the videos I just kind of think it's like watching a cat scratching themselves and rubbing up against anything with an edge on my desk. Wholly benign behavior that is a detriment simply due to their scale compared to us.