As they gear up for retirement, Baby Boomers may have to wait until the end of the decade to see Social Security privatized, a recent Delphi study by Diversified Investment Advisors concludes. But regardless of if and when Social Security is privatized, the study's panel of experts predicts significant changes in the way the retirement plan business will be run in the second half of the decade.

Among them, retirement plan assets will grow to anywhere between $15 trillion and $19 trillion in 2010 from the present $11 trillion, experts say. They also expect defined benefit plan assets to decline to 25% of total retirement assets from the 40% today.

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