This is simply not possible for very simple and rather obvious reasons. The main of which is that wealth doesn't mean money (though it can be described or calculated in money terms, since it's one of money functions). Wealth is what you can (or cannot, for that matter, lol) buy with the help of money, not the money itself (bitcoin or not bitcoin)...
Ok, you're right, it's not wealth, it's just money.
Even if you had a trillion dollars in cache cash piled in some warehouse, you still wouldn't be able to buy a country since nobody would sell you power. Real power can only be taken, often by force. Money can only help you here in an indirect way (bribery, mercenaries, etc)...
Are you saying that the fiat or bitcoin rich have or will have no means to effectively use their (financial) power? I agree that buying a country might not be plausible, however there must be quite some ways to obtain wealth.
When we're assuming we're moving from a full-fiat economy to a mixed economy including bitcoin (or other crypto for that matter), would you say that the fiat-rich will have no means to influence crytpo-currency adoption and can only maintain the same level of richness by shifting part of their financial portfolio to crypto?
To buy something worthy you need someone who would sell you something worthy. Why should they in the first place?
At first you admit that wealth is not money, then you again turn to fiat-rich as if they were not wealthy in real terms but were just sitting on heaps of cash. If their real wealth is not confiscated or expropriated during the process of crytpo-currency adoption, they shouldn't care. Say, you have a house, and its price can be denominated both in dollars and bitcoins (or any other currency for that matter). Does this playing with figures change its real value?