I see your point. If we are talking theoreticals w.r.t. your following disease/vaccine combination I would like to add the following:
It only works when the vaccine has no side effects long or short term.
Suppose that the scenario happens and a vaccine is in place at light speed. We skip all the normal trials (through cutting them short, whatever) and begin issuing it. We find it to be very effective at what it does and we force everyone to get under penalty of law, placement in a camp, whatever. Pick your poison. What happens if the pharma companies make exactly one mistake?
Now, we can name the drug. Let's call it Thalidomide. Is it worth causing, for example, horrendous birth defects to preserve herd immunity? Now you have to choose between saving people now versus saving people in the future. We have no idea what effects mandatory vaccination will have in 10, 20, or 30 years. That is a very scary proposition given how widely issued it was. It's also strange the FDA said it would take 70 years to release all the data. I think it's naive to think that there won't be any effect. Perhaps not as extreme as thalidomide - but how do we know today?
If someone doesn't want to take a vaccine they should be allowed to not take it. They are not immune from consequences. Such as, barring from PRIVATE non-tax-funded establishments. But bodily autonomy should go unquestioned. No matter which way you cut it vaccine mandates are a strike against civil rights.