Long term, I think some mechanism to mandate more social isolation is going to be needed.
For example when travelling from California to Arizona, there is currently no quarantine area or checkpoint, and that's fine if you want free movement, but then it's harder to say that states should run their own pandemic policy as long as there is free movement between states.
And this is a general trade off. More interconnected world => localism is less viable as a means of countering global threats.