So the bottom line is that you have to have enough cash to sustain a $60,000 income on something that can't take your principle, such as CD's or Treasuries. Get out your calculator. Current CD rates are about 3% in a best case scenario for a lot of money. To get 60K you need 2 million in cash reserves at the present no loss principle rates.
HC, I do get what you are saying. My long term retirement plan is to save enough and spend little enough to live off my TIPS interest if I had to.
I think you are right, most people are never going to save enough to retire early if they have to save a huge amount of money. But I think a lot of the people who post here aren't in the majority. And as others have noted, many have fantastic pensions, some sold businesses, some are extremely frugal, some are in unusually high paying professions, some have two six figure incomes, some received inheritances, some live in low cost of living countries etc.