People with allergies and pregnant can get the vaccine for the most part, but because I can't find relevant numbers, lets say (incorrectly) that anyone with a food allergy can't get the vaccines: that'd be 32 million people (https://www.aafa.org/allergy-facts/).

~60 million are <12 years of age, which means that they aren't eligible for the vaccine at this time, and I've seen reports that it is unlikely we'll have vaccines for the youngest among us. So 82% of the population is the absolute most we can vaccinate.

With the demographic numbers and the (admittedly terrible proxy of) allergy numbers, 86 million people wouldn't be vaccinated (~25%). With a 0.2% percent fatality rate, we are talking about 170,000 deaths if all of them get infected.

As I understand it, pretty much the only people who aren't eligible for vaccination in the US are those who've had an allergic reaction to a previous dose of the vaccine or one of its ingredients specifically and under-12s, though there are some additional observation requirements for people with a history of certain other allergic reactions. The former is quite a small group and children are at really low risk: https://news.sky.com/story/covid-19-only-0-005-of-covid-infe...