The problem is that the conditions we've operated under during Covid are not sustainable in the long-term, such as doing them every flu season. You could not simply switch back to businesses having capacity limits, schools being shut down, six foot social distancing being required, entertainment venues closed, people asked to say away from their family members, etc. every time flu season rolls around. And while you could have people mask up each flu season, we don't know what, if any, effect that alone would have because the virtual elimination of the flu has been with masking in combination with all those other far more harsh mitigation measures.