I used to take comfort in the idea that all things pass in time, now not so much. Probably because I realised that includes everyone I love, and myself!
I’ve no great love for the monarchy, but this is certainly the end of an era in British public life and likely in UK international relations - I can’t see the commonwealth nations welcoming King Charles as their new head of state.
And it is weird, there are some things you just never expect to change. I’m hardly a spring chicken, but Queen Elizabeth was not only there my entire life, but Queen far enough into the past before I was born to have interacted with historical figures (like Churchill).
Not sure how much truth there was to all that but it was a family member who told me and they follow this stuff a lot more than I do. It sounds plausible at least, and if that's how he does things, and then William becomes King, the monarchy might stick around for a while longer yet.