Economist magazine frets about Gen X's rates of return.

[Swampy]

This sounds like a father worrying about his son's retirement. If the young people have to worry about their returns, so do their parents, who will be living longer than their parents. Furthermore, as the labor force ages, they will begin withdrawing from their savings, and that will push interest rates up. Not only that, China may be set for a fall, as their companies' debt loads come to roost, which, again, means that interest rates will go up.
IOW, this decade will see a reversal of the trends of the previous one.