I've heard this discussed here a lot. Please lay out your entire plan on how to protect the most vulnerable until a reliable vaccine is available. It must be a very easy plan if it's discussed so much.
Well, your premise is false to begin with, so I guess we will start there. Society must proceed as though a reliable vaccine will never be available. Which is the most likely case. Any vaccination that is even partially effective is a bonus.
Once you come to that reality, what you have is a highly contagious disease that is non-lethal to the vast majority of society. In that situation, you allow society to function as normal.
You strongly encourage the elderly and medically compromised to self-quarantine. The degree to which those people comply is their choice. You inform the elderly and medically compromised of potential prophylactic medications that may be helpful (zinc, HCQ, vitamin D, etc) and encourage them to consult with their doctor. The degree to which the at-risk use such medications is their choice.
It really is pretty simple.
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