Curious if when Queen Elizabeth passes away, if there will be a surge in republican interest in the various realms outside of the UK. For the vast majority of the population in those countries, she's the only monarch they've ever known. Once Charles, or perhaps William, takes over, that link to the past will have been severed.
It's not so much a matter of removing the Queen as head of state as unsealing the document, so someone says while you are there, we need this, and we will fight you if we don't get it. You see how this escalates immediately, and all together within months of the Queen's death.
What are the odds of over 50 countries ever trying to rewrite their constitutions in a lifetime, and then again what are they to do that simultaneously ? Absurd, impossible odds, total black swan. Except if the Queen dies. I can only hope it will be mostly peaceful?