Taking our planet seriously is a planet of poor living majority. It is not surprisingly, that Global Economic crisis was probably inspired by non realistic decisions by "richest". G20 is an attempt to find new realism for all planet,not for the West. Hence,USA, G7 and EU must lost their dominant positions today.
IMF was traditionally tool for USA global financial regulation. G20 's IMF is another kind of institute already. I suppose that if new initiative group of some members of G20 is able to create a new Super Bank with New Super currency ( not SDR ) soon , it could be new way to new realism of 21 st century.