Fair point. One thing in favour of the Dolphins is they have played in the second tier for 33 years, which has allowed an entire generation or two to grow up without caring either way about the club. Manly have been in the top tier for decades, so people either love them or hate them.So if Manly changed their name to Sydney everybody would just forget their history and they'd siphon a bunch of support off of the other Sydney clubs? Because that's what you are suggesting will happen if the Dolphins change their name to Brisbane/whatever, and it's just as delusional in both cases.
I mean why not just call them the Australian Dolphins because all you have to do to "represent" an area is change your name to include that geographical area right, and with a market of 25mil they'll be the largest team in the country for sure .
The cognitive dissonance some people have when it comes to this subject is honestly astounding.