When our hypothetical boomer clients are in their 80s fully one third of the purchasing power of their nest egg will have eroded due to inflation. If they make it into their 90s, then by the time their kids inherit it, it'll have lost half its value. 

Is that the type or risk they're willing to take, losing half their money over 30 years? What will their kids think? Imagine $300K divided by 3 kids today, that would be a tidy amount to inherit, $100K. In 30 years they'd still only inherit $100K but it'll have the purchasing power of $50K today.