In my mind having some diversification in vaccines is a good thing. I understand we never used a mRNA vaccine on humans at scale before, so it is still somewhat

In my mind having some diversification in vaccines is a good thing. I understand we never used a mRNA vaccine on humans at scale before, so it is still somewhat experimental. It may work great but we can’t completely exclude an unexpected side effect in the long term. Also a few weeks shouldn’t change anything. We are talking about a 6-12 months vaccination campaign. I suspect the 80% number you mention is to eradicate the virus. I think at this stage it is a bit unrealistic. Between poorer countries that will not be able to vaccinate everyone and animals which can carry this disease, I would imagine the virus is here to stay. I think the primary objective is for it to cease to be a major public health issue. That it keeps contaminating people at low intensity in the background shouldn’t be a major concern.