I'm not retired, but hope to join the class of either 2012 or 2103.
I'll be 46 or 47 then and my wife around 40 or 41. Given the history of longevity in my wife's family, I have to assume the money will have to last her for at least 50 years (until age 90 and hopefully beyond). Over that kind of time frame, I don't believe that any retirement plan that involves a gradual spending of principal is sufficiently safe to be relied on. Given the damage that even relatively moderate inflation can do over even a much shorter time period (say 20 years at 3%), I am more concerned with combatting inflation than I am with dealing with volatility. If my portfolio is large enough, then the rents and dividends will be sufficient to meet our living expenses (avoiding the need to sell assets and taking a a lot of the volatility risk off the table (but not all of it)) and I hope that the dividends and rents will grow over time (more or less compensating for inflation). Accepting that nothing is guaranteed, I do intend to keep a small allocation to cash/near cash/bonds to tide us over any emergencies and disruptions to the cash flow. I'm also willing to move some of my investments to cash when valuations look stretched and put it back to work when they look cheap.
I am more comfortable with this approach than the traditional equity/bond/cash allocation even though it requires me to work for a few extra years.
I took a close look at TIPS as a solution and concluded that they don't work for me because (i) 30% withholding tax according to the IRS website and (ii) inflation is higher here than in the US.
I also took into account (a) my own risk tolerance and historic responses as an investor since the 1980s and (b) my wife's qualifications and experience as an investor.
I appreciate that this is unorthodox and is not for everyone, but I sleep easier with the market's volatility gently rocking my protfolio than I would listening to the sound of inflation constantly chewing away at it.
And if the portfolio outlives my wife, then we are both happy for our children to inherit.