All the data we have now shows that even unmitigated COVID-19 spread is not dramatically worse than a strong flu season, with the difference that COVID-19 kills far less younger and otherwise healthy people.
Even the argument that "we have a Influenza vaccine!" doesn't really cut it, because those vaccines are only 50% effective on average.
Of course, there are plenty of irrational reasons not to go "back to normal". I wouldn't be surprised if these were to prevail.
Governments around the world have just been handed powers they never knew they had, and I'm not talking about the power to do lockdowns.
I'm talking about the peoples of the free world demonstrating that they can easily be scared into compliance, that they will follow the dominant narrative, that they're ready to denounce their neighbors for infractions of rules "for the common good" - anything you would expect in a totalitarian regime works just as well in liberal democracies.