From global economic supremacy to second class status in a generation - is that the inevitable fate of the industrialised west over the next two decades? Growth rates, demographics and resource distribution all point to a new economic order so what will it mean for all of us? Stephen Sackur speaks to Jim O'Neill, chairman of Goldman Sachs Asset Management - the man who coined the term BRICs to highlight the new economic power of Brazil, Russia, India and China. Could this transition prove to be a rough ride?