if there are no future people working to pay your retirement, then there is no more economy and no more people to sustain whichever alternative "secure investment" you've made. a down economy completely devalues any alternative securities for any "pension funds" or investments, be it rented buildings or stock or other company shares.

not doing a redistributing pension only serves the investment companies selling the illusion of a better private pension.

Switzerland has understood this 20 years ago.