Of course, it's always possible vaccines may cause problems, down the road, for people who get them. Another, equally plausible, scenario is that people who do not get vaccinated, because they think covid won't be a big deal for them, get sick, seemingly fully recover, but then, 1, 5, 10, or 50 years later, end up with some unexpected, negative health consequences related to Covid-19. The link between the varicella-zoster virus that causes chickenpox and shingles, which usually doesn't show up until many decades after the initial infection, seems like a relevant cautionary tale to me.