People get concerned about migrants replacing natives. What they don't realize is that after just a single generation, the birth rates of these communities plummet. It's women's education all the way down. Women have a career? Less likely to have a family, and also (if they do) to start later and thus have fewer kids. Any article that portrays population decline as a good thing (often for environmental reasons) will actively promote this link. Only two things could change this downward birthing trend:

1) ectogenesis (babies grown outside the womb)

2) reversal of women's rights and political enfranchisement

So unless you're down with transhumanist or neo-reactionary ideologies, it's time to adjust to a world with more elderly than kids for at least the next century.