Seems to me, as you have noted prior about the IMF's mention of bailing out of the US banks and the continued assault to de-throne the US as a controlling banking power, the IMF would need to get out of the USA dollar printing biz to be the world bank.
The IMF has to destroy whatever respect and power the US gov may have as a world power and force the US to be just another second citizen dependent government under the IMF one world rule....
Destroying our dollar, perhaps instituting a gold backed standard and then going OOPS, there isn't enough gold, so I guess we (IMF) will just have to give the US MORE high interest, impossible to ever pay back 'loans' ... or some such creative instruments...