@Frantasaur
Honestly? I think it might be a wedge.
All authoritatian governents wants control over citizens and monitor them.
This could be a first step to implement this kind of controls, first to a 'minor group' then to everyone. The window of possibilities shift a little bit with every action of this kind.
Also, previously there were internacional arrangements between countries regarding visitors and such; but they can blurt any half cooked justification and extend that control to non-american people "in a legal-y way", instead of fliping the table as they do lately.