So if I understand correctly:
you mean their artificial inflation and leverage by constant repackaging won't fly anymore because the constituent parts's value of the derivative can be better calculated because they are all traceable.

What happens though with the underlying value of the assets, e.g. like the bad loans etc. : on paper they look like legit assets but in reality they are very shaky how is that solved by the blockchain, is there any way to track, say repayment rates and calculate true value of the derivative instantly?