Europe is very different then the US. In particular because the US was founded on religious puritan beliefs. The US courts still lean towards favor on the religious organization's side then the individual's side. Though over the years it is starting to change a little, however, slowly it goes.
If you think about it, Bush is a religious nut. Bible thumpers still have a strangle hold the US. They are a large force to deal with. People may think that most other religions don't like JWs would be glad to take down the WTBTS. However, any laws that are put into place regarding one religion would set precedent, you cannot hold up one religion and then not use that same measuring stick on other religions as well. Think of all the funny religions, they would not want a change in the "volunteer" status either, because it would effect them as well.
I know people like to think that watching France and what they ultimately do will have some effect over here as well. Even if something happens in France to change the status of JWs, do you really think it will effect JWs here in the State. Hell no! The US hates France and the other way around. If anything, the US will hold up France and what they did as a violation of something like religious freedom.
Anyways, JWs would just use it as a form of persecution and support their claim that the US and the courts are run by Satan and Satan is trying to destroy them. This will just bolster JWs to preach more and do more. The struggle needs to come from within.