I will talk to the guys at Gulfcoast Raceway in Porter, (Houston) Texas. This is one of my local tracks and is more than capable to handle an IFMAR event. I can tell you that from what I have heard, is that they had a really sour taste left over after the 1/10th IC Worlds. However, I think that they might be able to be persuaded into hosting an other event. They had bid on the on-road nats and if they would have gotten them, they were going to re-pave (although the track is still in good shape) in order to change the layout.
As long as there are guidelines with as what to follow, the organization, while time consuming is not a project that can't be handled by a competent group that understands how to fill out forms and is capable of coordination simple logistics. Now finding a group that is willing to do this is another story. If they do decide to host, I will try to see if I can help them organize the event. I would definitely be willing to give up some of my spare time to bring an event of this magnitude to the US.
Our problem would be setting up the carpet track. We would have to organize something in a convention center of some sort, unless we do get our carpet track in town by the end of this year.