The Year 2020 Possible Collapse of the United States

When I consider that which you already confided to me during my Great Trip in 1975, that, according to your probability calculations, the superpower USA could come to an end after 2020, if nothing in this country changes for the better by then, and if those who are the USA’s allies continue to dissociate from that country, or even become open enemies of that country, then could Obama perhaps be the crucial point so that this can indeed still be prevented?