its not gone anywhere,
banks were greedy and lent money heavily to NINJAs (ni income, no job or assets), at escalating rates after initial fixed term periods,
they didnt care about the security on the loan as there was so much profit built in they could sell the loan in the secondary market,
a bank that sold these unsustainable debts will be relatively unaffected however many also bought these debts and resold again and on and on....
the banks concerned can fail and should be allowed to go under, a lesson learnt,
to create a false market is idiotic,
look up the 'dutch tulip bubble' and see how greedy people will lose the plot and invest in something worthless