you have to retain a majority of that heritage, and integrate newcomers. Otherwise it's no longer Denmark.

what you are asking is not possible without rejecting immigration.

that is the delusion. it is the same all over europe. people expect 100% integration. yet at the same time, prejudices will reject them if they are not completely invisible. that is not possible, and it is not the integration i would want. i have written about this before: https://news.ycombinator.com/item?id=44746099