I mentioned on this forum previously a tv series I watched a few years back. It was about UK streets and how they've changed over the decades/centuries. Found it interesting. e.g. one street was originally populated by middle-upper class white people, then gradually the area went downhill and the houses became populated by lower-working class people of various ethnic backgrounds. More recently, the area is once again on the up, houses worth a million plus, populated by middle-upper class people of various ethnic backgrounds. In short, over the decades each street changed this way and that in terms of who lived there, property values and so on.
Perhaps the same can be said of the country as a whole. I think it's perfectly reasonable to assert if we were to come back 50-100 years from now, we might not recognise the UK in terms of ethnic and/or religious mix. If half the predicted stories come true about more migrants moving here and there, including climate migrants, we ain't seen nothing yet.
Here in Scotland there has been talk of building entire new towns that would predominantly be for migrants, in a sense future strategic planning to ensure these people have places to live.
Regardless of anyone's views on migrants and whether or not they should be allowed in, welcomed etc, I suspect the issue is simply going to get worse as the years roll by. Another reason I'm pleased I'll be out of here ~30 years from now if I'm lucky.