Wherever possible, banks must be capable of weathering those kinds of storms. In view of all this, I believe that two elements will be especially important in making banks more stable: capital and liquidity. Deficits in both of these things were factors which contributed significantly to the financial crisis.
The state can bring in regulation to address these deficits, and has done so very successfully. Amending the capital and liquidity requirements was therefore very high on the international reform agenda right from the start. And the new Basel III regime significantly raises capital requirements for banks.