No offense taken. I'm happy to generally call myself a liberal, given what I think liberalism has given this country. I'm also a liberal with a degree in economics, an MBA (and studying for the CFA), and a background in investment banking, so I like to make sure the numbers all work and the scenario analysis all done before I agree to something.
This is not an issue of just quibbling over varying growth rates. The growth rates discussed are those required to maintain purchasing parity for the nominal dollars being discussed. As you know, inflation erodes a dollar's buying power. Inflation is typically denoted by changes in the CPI over time, so that in an inflationary environment it requires more dollars to buy the same basket of goods. That's what these increases are designed to ensure. The progressive indexation idea by Pozen gradually adjusts this from the wage index to CPI, depending on income. Wage growth has typically outpaced CPI by about 1.1% annually. So over time, and especially long periods of time, the difference between income indexed to wages and income indexed to CPI becomes pretty dramatic (the power of compounding). However, since at least CPI guarantees buying power, this is something. But people retiring would be in for a rude awakening as their benefits would be far below their wage experience, and certainly far below in nominal dollars what they are currently promised. So with no ambiguity it would be a benefit cut.
As for the private accounts issue, which Bush seems to be running away from, I'm not sure your comparison of those retirement plans and the spotty notions of private accounts I've heard is valid. First of all, from what I've heard, these private accounts would be more similar to 401Ks than any pension fund you've described. In addition, I'm not sure whether the pension funds you've described are defined contribution or defined benefit - since most pension funds are defined benefit, then I'll assume that.
Defined benefit plans are large sums of capital designed to be invested, where the returns and employer contributions pay out a defined benefit stream, which is predicted based on actuarial projections. With size and scale, it benefits from being large enough and cross-collateralizing so that in any individual year, individual people have almost no risk of not being paid out. By contrast, a personal account, or for that matter a 401K, it's every man for himself. If that market does well, then great. But if the market tanks right before your retirement, then you're screwed and you've got no cushion. And it's this investment risk that is fundamentally problem.
You can point out that in the long run the market does reasonably well - depending on whose stats you read, anywhere between 7% and 11% maybe. However, in any 20 year period, the market has real meaningful volatility. And nobody I know gets to retire only when the market is doing well.
------------------------------------------------------------------------------
"They who would give up an essential liberty for temporary security, deserve neither liberty or security" - Benjamin Franklin
"Don't you see the rest of the country looks upon New York like we're left-wing, communist, Jewish, homosexual pornographers? I think of us that way sometimes and I live here." - Alvy Singer, "Annie Hall"