Ditto for australia, we even had the debate about our internal borders. Last calander year (australia uses different financial year) we had a yearly increase in GDP of a few percent, while some of that would be attributed to cash thrown at country by the federal government . Taking that out its not the doom and gloom predicted by open all the borders people. For us (australia) the big next one will be when the government ends the a employment support in march.
At the moment what australia, NZ and other countries did by locking down internally and internationally has proven to be the right decision in both a health and economic measures. Does that continue to be the correct decision in 2021, well have I no idea. Glad I am not having to make the decision