I asked my GFs who are elementary school teachers last night...they hadn't even heard of this movie....they also didn't know who Ben Stein was. (Until I reminded them of his role in Ferris Bueller's Day Off.)
When I told them what the movie was about there was much eye rolling and scoffing.
Yup, I don't think it's going to be too popular outside the US, and then only in certain groups. It will mostly be a 'preaching to the choir' type of thing, I think.