Possible but this is the new normal. One can not stop becasue of this. Best would be test everyone coming in to the country and send to quarantine if found positive(I think, HK is already doing this).People complaining about why NDVO is not in hurry to allow CoPR extensions, this could be one reason
https://www.hindustantimes.com/cities/hong-kong-bans-air-india-flights-for-2-weeks-after-11-passengers-test-positive-for-covid-19/story-9u6Vn1iXVdyPfvF3YmxUbO.html
But it is the decision taken by a country.