I really question the impact of testing alone. Humans are very adaptable. I don't think there is anything about pre-testing that most people cannot and will not easily take in stride, so I don't believe that is the major hold up for most people. As has been pointed out there is the fear of being quarantined which I would agree is far more impactful than taking a test or even the inconvenience of a failed test, and of course there is also the basic concern about catching COVID. I believe those are the big ones, but I just can't see very many people who are willing to take the risk of being quarantined and/or catch COVID but unwilling to take a test.