The only way to do a proper shut down at this point and not stop all travel is to require vaccinations and masks as well as immunization buffer for any travelers, with severe penalties including instant jail for any mask trouble makers on flights. Clearly fines are not enough.
If we want to end this, we need to get serious. We have tried just about every nice way.
I am still an advocate of a deadline for vaccination with an immunization buffer and after that, healthcare will still be provided, but at incredible cost to the willfull offender, not covered by insurance, unless for a medical reason ONLY. Religious exemptions are out.
Wanna lose your house over this?
Now, maybe this Delta isn't enough of a motivator, but as we delay (because that is what we are doing) and provide a great environment for it to mutate, we may end up with an Ebola like variant that not only kills more visibly and quickly, but also completely goes past the existing vaccines.
We got relatively lucky with the existing vaccines. It may not happen in such a quick time next time.
Then, perhaps?