Yes, I know – it was meant more like a joke really, the very idea that people will change their language habits just because PAN changed the poor creature's name last year is a bit laughable… In fact, I had to use google to find out what they renamed „świnka morska” to, because I couldn't recall it. ;)
The way I understand it is that everything has a scientific name and a lot of things also have a "cultural" name. I've always felt like the scientific name is comparable to how stars are named. No one really calls them that, it is mostly meant for efficient study and cataloging.