I'm not so sure we'll end up seeing all that many mandates in the West. By the time vaccines are amply available, Covid is likely to reach non significant numbers, and if the 95% immunity holds up, people aren't that likely to care about being potentially exposed to somebody who didn't vaccinate.
Mandates will be primarily for entry to Asia and countries who never got accustomed to high attack rates.
How common are long term effects from vaccines? Short answer: Not very. The primary concerns in vaccination trials are usually immediate effects, which these vaccines don’t seem to have (other than standard flu vaccine side effects).
I believe there was never any long term effect discovered in a vaccine that wasn't evident after 2 months.
It's like measuring the effects of a punch after 2 months. The impact is completely over and the body is intact.