Leaky travel restrictions to me are more unjustified than stay at home orders in terms of cost to benefit, urgency of the policy for systemic integrity, the breadth of impact, and the unintended consequences. Most importantly they strongly disincentivize developing countries dependent on global travel/tourism from active genomic surveillance and transparency.
They'd have to be very early and very strict, and it seems very unlikely either would occur.
I hope they don't become a fixture of global policy for future epidemics. Many diseases are much more easily controlled by traveler screening than this virus such as Ebola. It would be terrible to create environments where countries feel the need to cover up epidemics, or where migrants are incentivized to bypass official ports of entry where such screening can occur.
The cat is already out of the bag, and if it is as bad as I think it is, another wave is coming, this one much worse than the last. Now would be the time to begin rapidly implementing a federal policy of mandatory vaccination that gets a lot more shots in arms ASAP, and also gets a variant booster designed for this variant to the majority of the population ASAP.