The implication that letting immigrants enter the country 'devolves' it is, without the shadow of a doubt, highly racist.
I was brought up by a Muslim family in the Middle East and live and work in London alone now. I don't ascribe to any faith and am highly leftist politically, and hope that what I do every contributes positively to the community I am surrounded by. There are thousands of others with the same story to tell. I don't see how this converts the lands we live in into 'slums', unless seeing a high population density of (typically) brown hairy people makes your skin crawl.
Leavers left the economy in shambles to the point where non-UK residents are looking to invest in property because the Sterling is so cheap. It isn't inherently a bad thing, but it must be well unsettling to think that a piece of land you pass by is owned by someone who doesn't reside in the continent, let alone the city. Meanwhile people from other countries within the EU who've helped the UK's economy flourish are being told to pack their bags and leave, as if "stealing our jobs" was ever a real issue when globalisation helped only to create them. But hey, I guess the NHS will benefit from additional funding, am I right?
TL;DR human genetics and ethnic proportions are in flux because of the way mankind is progressing. It is inevitable and trying to create a tiny bubble that remains unaffected by change is unrealistic. Let it go.
