Maybe you're young, but this 'feeling of stability' really has only happened since 1991.
I remember before that, and it was very scary living with the Soviet Union and all those countries with nukes pointed at us.
Also, the 1960s-1980s wrought huge economic change, as the last phase of major 'Democratic Socialist' changes occurred, desegregation/civil rights in the US along with giant leap in crime, and most of the west moved out of a very chaotic political climate only towards the end of that.
1990-2010 was a bit of a calm period.
Also, 'Brexit' is not a net negative thing (I think it's neutral on the whole). The EEC (i.e. trade) is almost all of the benefit of the EU, some of the post EEC i.e. EU artifacts are actually quite a bad thing (though not all of course). Even Euro itself, is probably only 'neutral' in that it has very harsh externalities that are just not obvious.
Notably, we have seen a massive failure in the EU to not only protect itself, 100% dependent on US military defence, even in 2020 - but one of the 'root problems' was the EU powerhouse, Germany, abdicating it's defence responsibilities, and selling out the entirety of the EU to Russian energy dependence which put the EU in an existentially weak position vis-a-vis Russia. If the US did not exist, Putin would be dominating the EU via it's vast tentacles (like it is in Hungary, but much worse, and all over).
Obviously some nations, like France, Sweden and Finland are quite prepared, but on the whole, it's bad.
Europeans are know this, Macron himself has suggested 'something else' for Ukraine and Georgia.
It will literally take decades for Ukraine get into the EU, which is nary impossible for any normal country as they cannot maintain a consistent strategic orientation for that long, which speaks to the gigantic bureaucratic complexity of the EU.
Instead - UK, Turkey, Ukraine, Finland, Georgia, Switzerland will possibly join the 'expanded' EU (by another name), which will mostly be trade focused. The interesting thing about that however, the other nations, notably Spain, Italy, Greece will definitely start to wonder about 'the grass being greener' in those countries.
QE2's death is definitely a kind of geostrategic demarcation, along with the failure of Russia in Ukraine as it's 'last gasp' as a major power, and COVID. The rise of China as well, but that's in phases.
This is kind of a WW1 moment.
As for the future of the Royals? It's hard to say - some progressives may want to think more 'Republican' but I'm not so sure. We are choking on materialism and people are yearning for authentic things.
'Secular Ideologies' including Socialism and Capitalism have brought us some nice things, but we are fundamentally more hollow. 'De-culturlization' isn't going so well, people are spiritually empty, we lack community. Putting a 'Starbucks on Every Corner' of the world is good for the GDP, but it's woefully lacking otherwise. A trip to the suburubs of Toronto where things are actually technically 'good' from a culturally secular perspective (i.e. peace, jobs, people get along well) ... but you'll find it's a kind of cultural death: absolutely no local culture whatsoever, almost the entire population working for 'local offices' of international firms, nothing to even identify the area as belonging to it's actual nation, culture and values being dictated by the marketing rooms of foreign countries, mostly in the name of selling sneakers and iPhones. That's 'materialism' not true 'prosperity'. It's amazing if you were a poor kid from Hyderabad (i.e. to have material stability), but not so good otherwise.
In that context, everything that has cultural authenticity is basically worth more than anything else. Do you know what's exploding in value? Authentic Faberge eggs. As we also realize the value of cultural institutions. Other things, even neat things like iPhones, are ultimately just commodities.