By the way, I'd suggest that the mortgage-backed securities were a lot bigger factor than the interest rates. Banks were lending money with no down payment and minimal credit approval because they could immediately sell those mortgages. The poor-risk mortgages were packaged together and sold as top-grade investments to pension funds, etc. The corrupt rating agencies rated those mortgage-backed securities as high quality investments even though they were full of bad risk loans.
But this whole tangent is pointless because CC isn't fluid money yet. There are times and places it is useful liike transferring large amounts of capital without a need for a third party, store of value, aesthetics, etc. Not a dollar replacement.
A CC economy will eventually relpace the dollar economy.