Earlier quoted context omitted.
"The fact that humans are the only reservoir for smallpox infection and that carriers did not exist, played a significant role in the eradication of smallpox." https://en.m.wikipedia.org/wiki/Smallpox#Eradication SARS-CoV-2 eradication is probably impossible.
Yup. And that's why I would not want to see a treaty. Better to have nations acting independently of each other at the policy level, learning from each other's experiences. It's like a market where nations can explore different tradeoffs in how they declare an end or live with it.
Absurd example, but that seems pretty harmful to every country with transportation links to me.