From what I've read the UK will have to face losing about 9,500 millionaires alone in 2024, a figure much higher than last year. These are thought to be due to superior tax conditions and lifestyle benefits in Dubai, Switzerland, and Monaco. Of course, not all is gloomy for the UK; for every few rich men moving out, many more are still lured in by its stability and possibilities, especially where finance and technology are concerned.
The argument that countries would collapse without the rich, aside from such an event being quite unlikely. Most governments tend to correct their policies as soon as a few rich people relocate to avoid fallout. Much more the countries like UK have to offer other than just base themselves on ultra-high-net-worth individuals. The real problem lies with the middle class taxpayer who has been bearing the main brunt of increased taxes and changes in economic circumstance.
The rich became so having known how to navigate the intricacies of tax paying. That is, in some cases, these rich people don't get to pay their taxes in same way the poor do, because as we see the poor getting taxed from salaries or wages, the rich get their businesses to pay their taxes for them and through these businesses they can acquire property that wouldn't be taxed much because it was bought and paid for by the big business or corporation they oversea.
A rich fellow or family with few cents in their main account may have so much more investments that could span into cryptocurrency ETF, bonds, stocks, real estate, other businesses. So they are always sure to have money one way or another, and when a country is undergoing some financial crisis, these so called rich persons may be called on for financial insights or loans that may require the government to trade information or secrets with them but where such doesn't happen and the rich becomes the target by government to be milked from forcefully or with policies that would make them lose much of their possessions, you then see these rich people leaving to other counties or regions to live and be independent.