I think I’m basically arguing semantics really! Would there be a change to British culture? Yes. Therefore, for those that like things as they are, that *would* be a lessening of British culture because what they like will no longer exist as it was, even if the actual changes would be seen as positive from almost all other points of view (enrichment of national identities etc).
This is what I mean about this possibly being the wrong argument. To convince such people to vote yes, they will need to be convinced that the changes to British culture would be for the better rather than that a change wouldn’t happen at all. Because we both agree it would, and for some the very fact there would be ANY change IS the detrimental factor, rather than any specific aspect such as loss of the BBC as is or flags etc.
A lot of people like stuff to stay the same, and they don’t always have to have a coherent reason to feel that way and indeed may still feel that way even if elements of their fears are debunked. To sell them the idea of independence being a good thing they need to be reassured and convinced that British culture would change but crucially that those changes would almost certainly be for the better; effectively, you need to cancel out their innate negativity from the fact *any* sort of change may happen by accentuating the positives to a level where they see an overall net gain. That’s a tricky thing to do, so I don’t envy the “yes” campaign marketing people!