I should maybe add 'in my opinion'. But in truth, I really believe it's wrong. It does not lead to anything positive, quite the contrary. And I've never seen a community become worse by moving into a more modern, open view on diversity and acceptance. And to focus: I really, truly mean that the idea that what "makes" you (and that's what I was commenting on) is your ancestors, is just wrong. Genetic chain? Well, so what, we're all a part of a genetic chain, and the same one at that, which goes back nearly four billion years. Take one step back to get the overview and it matters nothing (nor should it) who your father was.
"more modern, open view on diversity and acceptance" is not positive by itself. Unless you're looking from the point of view of those entering the country, which are people that nationals don't have to care about.
I'm actually taking the point of view from the nationals, as you call it. With people coming from other places on earth the area I'm currently living in became a good place to live. I got the nicest next-door neighbours it's possible to imagine, for example. My wife cried when they moved to another place (to get more space). The city center is also a vastly more dynamic and interesting place to be than it used to be back when everything was monotone. Back when the only non-native language you could hear was a little bit of English, and the occasional tourists from nearby countries. Now there are more than a hundred languages spoken here. It works fantastically well, but it demands that you avoid creating ghettos for immigrants, as has been the unfortunate expericence of some cities elsewhere in Europe.