Thanks to everyone for commenting on this post!  At this point, I am not worried about my status in the country or about the ability of ACS to continue to hire American teachers to teach here. Our school clearly have connections within the country and a tradition that will allow us to continue to do the work we do.

What continues to seem worrisome is the fact that the act as currently written limits fairly drastically the kinds of people who can teach in Bulgarian schools given what's been outlined in demi's comment above. The problem of course is this: it's one thing to be a permanent resident and a very different thing to have a work permit and a prolonged residence permit which is what American ACS teachers currently have. 

I'm not advocating for taking jobs away teaching jobs from Bulgarians but I would continue to argue that the presence of a native speaker in a school dramatically improves the teaching of foreign languages and student fluency in the language. Moreover given the current state of education in Bulgaria, Bulgarians need to have other options and international schools help to fill this current void. Limiting the country's access to native speakers limits the kind of education both linguistic and cultural that Bulgaria can provide its students and in my mind this is a shame.