I can understand the logic behind it, but at the same time it is a hammer blow on the tourism industry - airlines are potless and more will go bankrupt.
The best way to go is to continually expand travel corridors (not just a one way thing which is what we appear to have here in the UK) and reassess high risk areas with a common global approach, although of course it has proven that it is impossible, even in the EU, to have consistent rules cross border. As soon as next week comes around and people start to get jabbed, death rates and hospitalisations will come down tremendously as the most high risk patients get vaccinated.
Come the spring, I can't see why countries who are well underway in their vaccine programmes cannot start fully opening up.
To have a strategy to lockdown as soon as you have a handful of cases is just unsustainable. It is so ingrained in the population globally and the virus will still be in the system for a very long time - maybe years.