At present, there are two problems in International Relations. First of all, some nations are immensely rich and some nations are much poorer, so the current attempt at solving this uses interest-bearing loans to the poor countries, but this clearly makes matters worse. Secondly, the elites in the rich countries resent being taxed to make these international loans, and find ways of hiding their wealth in "tax havens" etc, so the loans therefore come from the poor people in the rich countries and inequality there increases.
One possible future development for the banking system would be as part of the international support which a nation-state gives to the poorer countries and so generates a global Co-operative Commonweal. So, a country which feels that it needs extra support from countries which are more favourably placed, could make an appeal to the international banking system for financial support on a grant-not-loan basis.