I will just add that Canada is likely to remain a monarchy long after it is abolished in either Australia, or the UK if it ever decides to abolish the monarchy. You mention voting in a referendum that was designed to canvas options on possible government models that do not rely on a monarch as head of state. That is not possible in Canada. With the repatriation of the British North America Act in 1982, an amending formula was adopted that generally allows amendments to Canada's constitution where at least 7 provincial parliaments, the Federal parliament (which consists of an elected House of Commons and appointed Senate) approve a proposed amendment and those 7 provincial Legislative Assemblies must represent more than 50% of the Canadian population. It's a relatively high bar for consitutional changes, reflected by the fact that it has only been used once, in 1983. However, when it comes to the monarchy (and several other matters like the function of the Senate, the Supreme Court, etc), there is a separate amending formula called the "unanimity formula" that requires unanimous consent of all 10 provincial legislative assemblies and both Federal Houses of Parliament, before any changes, including potential abolition and replacement, can be approved. De jure, that makes any potential changes to Canada's monarchy almost impossible, as that formula will in practice, be difficult to fulfil, if you know anything about Canada's constitutional history. So I fully expect that several generations from now, Canadians will still be singing God Save the King/Queen, barring any revolutionary changes, (and Canadians pride themselves, to some extent, define themselves, in opposition to revolutionary change). So insurrections are frowned upon by the vast majority of Canadians.