I think there are a lot of people who have concerns about the impacts of mass immigration removing the culture in certain areas. I think you could ask people in Brampton or individuals in Surrey what they think about the language being spoken around them, whether it's a Canadian language whatsoever, whether they feel that their culture is being preserved. I don't think it's an insane concept.
In fact, I think many liberals would agree that many cultures and peoples have been replaced before by mass immigration—our indigenous population not least of all.