Can we conclude that this is the wistful daydream equivalent of the "Maserati Problem"[1]? I can definitely say that if 30 years we're looking at half a million dollars as a "cost of living adjustment", that world will for the people who don't make that kind of money be Thunderdome. I mean wages have barely kept up with inflation. In the last 40 years (between 1967 and 2007), median wages have only gone up US$10000 (…
Can we conclude that this is the wistful daydream equivalent of the "Maserati Problem" I'll go out on a limb and say that even normal retirement planning (50 years into the future) is a Maserati Problem. Everybody that makes very long-term projections about money -- whether it's the gloomy "interest on $4m won't last 40 years" variety to the rosy "save $300 a month and the compound interest will make you a millionair…
The reason for that isn't financial but usually due to wealth dissipating though marriage. Some wealthy families relied on arranged marriages to keep the wealth in the family, but this kind of arrangement had it's own problems (first cousins marrying each other for multiple generations has clear genetic issues).
Nevertheless, some examples still exist: http://en.wikipedia.org/wiki/Rothschild_family (often claimed to have controlled the largest private fortune in history) http://en.wikipedia.org/wiki/House_of_Medici (although the Medici's lost most of their fortune in the 18th century)
Many rich European families were ennobled at some point, which makes their history more confusing. For example, the Duke of Westminster (6th richest man in the UK) is rich mostly because of his London land holdings. There are numerous other examples like that.