"major culture shift" != "they will turn your country into the country they fled from".

Regardless, the culture is that of a nation of immigrants. I don't see how anything here can cause major cultural shift away from that. I am willing to bet you won't be willing to elaborate either, so next goal post move please...

Different people are different. Any change in demographics — such as an increase in wealth inequality or number of smartphones — causes a major cultural shift. What is the evidence that this particular cultural shift is very bad?