Unfortunately, 18-year-olds generally can't be trusted to go a whole semester without succumbing to the siren call of easy GenAI A's. So even if you tell them that the final will be in-person, some significant chunk of them will still ChatGPT their way through and bomb the final.
Therefore, professors will probably have to have more frequent in-person tests so that students get immediate feedback that they're gonna fail if they don't actually learn it.