If one passenger could infect a whole flight then surely with that rate of transmission, rates would rise exponentially. Any cinema or restaurant he visited would result in total infection which would be spread at similar rates by those infected.
We've managed to live with other diseases such as AIDS, TB, Syphilis, Flu, Yellow fever etc without being able to eliminate them and we're going to have to do the same with this one. Shutting down the world for 6 months isn't an option. Vaccination and precautions should keep the problem at a manageable level, total elimination isn't a practical goal at least in the medium term. Closing the borders and locking down just because a single case gets reported isn't realistic. Some people will slip through the cracks and will get sick and die even if they had the vaccine, but in very low numbers which can be coped with. ICUs won't be maxed out and relative normality can return.