We've had a bit of this discussion on here before about all of this. First, Codex is an international standard and honestly, the chances of it passing as U.S. law are fairly slim.
People like to get on the Bush administration for not playing nice with international treaties (Kyoto jumps to mind), however, that same disdain for other nations (esp. Europe) dictating how the U.S. runs itself as a nation makes me think this will not get too far. Plus, Orrin Hatch (who is a big supporter of the supplement industry which has a lot of weight in his home state of Utah) has too much clout to allow it to happen.
And before we begin the Republican bashing, keep in mind that the DHEA ban is sponsored by a Democrats.
But the vigilence must remain to avoid the chipping away by politicians (of ANY party) who are trying for some kind of public relations coup to "protect the kids" from "dangerous supplements".