Britain is in trouble

[kılıç_mehmet]

I realise that republicanism is unpopular in the Uk, but eventually the royals will be removed by political mandate from the people.

If you remove something, you need to fill the hole that they have left in their place.
I already said that the crown is the foundation of the British nation, and without the crown "United Kingdom" will soon be "Divided nation states", compromising Scotland, England, perhaps Wales, and also Northern Ireland, which will probably be thrown into another turmoil, as Ireland surely will try to take over, and the protestants will flee to England, creating another crisis.
If the people wanted to remove the Royals, they would have done so long ago, when the great Dynasties of Europe fell, in Germany, Austria, France, Italy and etc.
They didn't, and I don't think they will any time soon.

But it is a relic of an era no longer relevant to the modern world. Republicanism will one day win out, and I will be glad for it.

Well, which era? It encompasses several eras, it has seen the French revolution, the Russian revolution...It should have been irrevelant back then, based on your words.
The Russians replaced Monarchy with yet another Monarchy. The Monarchy of a Communist dictatorship.
The French have not replaced it with anything, and they've fucked up ever since, with no real national glue in place.
And what will you replace the Monarchy with?

Christianity is an irrelevant relic to the Britain now, especially the Anglican churches.

Oh come on! The Anglican Church is a part of your damn fucking heritage. It symbolizes your independence Rome.
You throw away two main aspects of the British nation without blinking, yet you have nothing else to show.
Disestablish the Anglican Church, and condemn the Protestants in Northern Ireland to their fates.
Disestablish the Anglican Church and allow for another long lasting presence of the Vatican in England. Remember that your Church is actually not a true protestant Church, its merely an offspring of the mainstream Catholic church, and people will soon look forward to a new patriarch to be their spiritual leader.
After you disestablish the Anglican Church(which requires you to abolish the Monarchy first), what are you gonna do?

There's greater political and social will today for disestablishment than there ever was.

I think that those are enough to make UK into a no-mans land to be ripped apart by native and foreign ethnic minorities.

They can sustain themselves. As my post above says, the duchy of Cornwall alone brings in tens of millions to Charles.

Well, after the abolishment of the said Monarchy institution, there won't be a "duchy".

They can live off his income and be happy with that. Social Security benefits are either income- or contribution-based. I doubt they've made many National Insurance contributions, not actually having paid jobs, and their savings would rule out the other. Of course if any of them want to get work, I know some cracking job sites.

Well, since their income is based on the hereditary titles and belongings that are tied to those titles, abolishing the monarchy would require you to seize those belongings, leaving the Royals, the Barons, Lords and others with no income.
OF course, that spells "revolution" to me.