The formula-lover in me wonders about doing something like this for defining these levels based on the avg income of cities. Your definition of “blockbuster FI” is being able to live anywhere in the world, which could be the point – but the low end of blockbuster could be wherever in the world you want to live. I like that idea of planning for options.
The doctor or lawyer, for instance, could use her or his income to invest in a medical start-up or buy shares of medical companies he understands such as Johnson & Johnson. Over time, the nature of compounding, dollar cost averaging, and reinvesting dividends can result in her or his portfolio generating substantial passive income. The downside is that it can take decades to achieve enough to truly improve your standard of living. However, it is still the surest path to wealth based on the historical performance of business ownership and stocks.