[chii]

but you'd expect that technological advances to prop up the implied drop in worker productivity (which is why there's an implied scarcity of goods and services in the future).

What i know for sure though, is that a large number of future retirees hav not have saved up enough for themselves.

[ThrustVectoring]

Retirees as a group cannot save their way out of the pension crisis - an extra TV made in 1998 does not materially impact the ability of society to provide health care to a retiree in 2018. You'd have to physically store goods for later consumption for this to work at all. All you get out of extra saving today is higher asset prices, allowing current retirees to consume the extra goods that current workers neglect to consume via saving.