White flight has happened here in Toronto. Go into almost any public school in the city the vast majority of students are brown, black and yellow. Same with Mississauga. White folks have moved to areas North (Aurora, Newmarket, King City Bradford), east (Whitby, Courtice, Brooklin, Cobourg) or (north)west (Burlington, Waterdown, Hamilton, Grimsby, Caldeon, Georgetown, Halton Hills). Vaughn/Woodbridge is still predominantly white as well.
At some point in the next decade or so you won't be able to call Toronto diverse because there will be next to no more white folks.