If it were to get closer to war (i.e., Spannungsfall, let alone the Verteidigungsfall) a set of laws would unlock that allow control of various areas of life and the economy anyway.

Interestingly, the travel permit requirement already existed in law before, but it was tied to the Spannungsfall/Verteidigungsfall conditions.

This new law removed this condition and preemptively "activated" the requirement even before the Spannungsfall was declared.