The biggest danger to the USA tech industry isn't even the customer blowback, which might blow over soon enough. The biggest danger is an opportunity for local competition to lobby the local governments to legitimately regulate US competition out of the market. For instance if the German government demands that all operating systems have to be open source (to prevent backdors) and replaces Windows with something like LiMux (which will of course be serviced by local companies who lobbied) and all companies dealing with citizen data have to use it as well, Microsoft could lose a huge chunk of market almost over night.