Looks like no one knows for certain if the vaccine will prevent the spread. What if the vaccine does not have a significant impact on the spread? I wonder how

Looks like no one knows for certain if the vaccine will prevent the spread. What if the vaccine does not have a significant impact on the spread? I wonder how the “protect thy neighbor” group will change once people feel genuinely comfortable their personal risk is lowered. https://thehill.com/news-by-subject/healthcare/528619-pfizer-chairman-were-not-sure-if-someone-can-transmit-virus-after https://thehill.com/news-by-subject/healthcare/528619-pfizer... https://www.bmj.com/content/371/bmj.m4037 https://www.bmj.com/content/371/bmj.m4037