Our current culture and economy is based on growth. If it were ever to stop, it would be a catastrophe worse than any Malthusian catastrophe.
It's a good thing the planet is so big. (And despite nay-sayers there is actually plenty of space and resources left.)
(And despite what you say, your wrong) Does putting it in parentheses make it true?
There is an upper limit on global population and resource replenishment.
And a static or shrinking population would have an adverse affect on total market cap, however it would also mean a great job market, because even as the economy shrinks the labor pool would shrink faster.
So your investments would not do well, but you'd always be able to get a high paying job.