I've talked on other threads about the issues of mass displacement (of Londoners, and other groups).
Mainly I've been addressing the problem of posters, who regularly on multiple different threads tell Londoners (or people from other areas where housing has been allowed to become unaffordable, or where there's limited work opportunities) to 'just move somewhere else'.
I was on a thread last week where several posters felt that affordable housing in London should only be for keyworkers. That would leave the question of where do other Londoners live? Obviously they'd have to move to other parts of the UK (terrible for them, as being displaced is very different from a willing move, and also impacts the areas they'd be mass displaced to).
The mass displacement 'solution' doesn't work. It simply moves the issues somewhere else, adding pressure on housing, public services or jobs there.
What's needed is addressing the root causes. Including the need to have, everywhere, good well-funded public services, more social housing, and work, education, and training opportunities.
Separately, although mass displacement is wrong, people should be able to move areas if they want to (that's different to being displaced unwillingly or out of desperation).
I've got friends here from other places (including from London, and also from abroad) and I like the mix we have here. Nothing wrong with some fresh faces and new friends and neighbours joining the community.