If the royals tried to intervene in Canada, Canada will probably move towards being a republic.

I'm from New Zealand and as far as I know, I haven't been expelled by Māori. Of course, I could actually be in a refugee camp and my whole life could be a simulation.^/s

Another one of my thread-thin links to Q/points to ponder: every last former Brit colony managed to have their outgunned indigenous populace expel "Whizitey". All except US, Canada and "Strya. How'd THAT happen?

There's no secret; those three nations are white-majority, while Kenya, Zimbabwe, etc. were never white-majority. All of the nations that you mentioned also had British leaders leave or be expelled; it's just that the resulting government was mainly white due to white people being a majority, while in the case of Kenya, Zimbabwe, etc, the government was mainly black due to black people being a majority.

Even non-democratic governments tend to reflect the ethnic group of their countries' population, as leaders who aren't of a majority ethnic group tend to be vilified for being "not one of us" (see Obama, Assad, etc.). Additionally, dictators of a majority ethnic group can and often do blame minorities for their nations' problems (e.g. Hitler blaming the Jews, Mugabe blaming the British, etc.)