If that happens, the border should not be open for a very long time. The only upside is it may tear through the US like a wildfire and then die out. Economically, that may be a better approach. The piles of bodies though. :/So, uh...what happens if emergency services needs to access your property, IE you need an ambulance, or your house is on fire?
Anyhow, in unrelated news Trump has all but confirmed that he's going to effectively "give up" on social distancing and closure orders some time inside the next 15 days. If that happens that officially scratches anywhere in the USA off my vacation list this summer.