You have a funny take on "only for a short period of time"

1942 , until to today is 70 years - ish.

In terms of a debt based system running full throttle - lets say 100 years...

Markets without this system ran for at least 4000 years.

('This system' meaning a financial industry , central banking and usury - compound interest in this context)

So in the scheme of things, and in context of civilization - anything post ww2 is short term. This doesn't make it sustainable - it's only 2 generations away...

For comparison, do you see the fossil fuel industry as 'for a short period of time'?
It is, relative to the history of man, and this also is probably not sustainable..