The proctor does not even have to know the subject, so there could be a few shared exam-taking centers for entire university. There could even be remote proctoring centers for those remote students, although it introduces risks of dishonest proctors.
Or the alternative, which is already kinda happening, is that degrees and university names become less and less important, and instead job admission becomes harder - in-person interviews only, hard tasks, and absolutely no AI allowed. This, in turn, means that will be are a lot of recent graduates who have paid the full tuition price but cannot find any job - they fail every interview because they cheated their way through college. Which means if some college _does_ introduce in-person, no-personal-devices rule for all of its tests, it will be able to sell this to both employers ("our students did not cheat") and the students ("our graduates have high hiring rate").
This means future students are better learn to work under time limit. The nice times of take-home and remote exams are coming to the end.