It doesn't end. The virus is immune to our wishes and feelings. It is largely immune to our attempts to model it and guesswork. What works so far, is vaccines and a degree of restriction during social interaction, ie masks, distancing and well ventilated buildings. I say ‘so far’ because there isn’t enough long term data on the vaccines, but to date it looks very promising.
My point on the ‘unforeseen’ is that while the virus continues to be an unknown risk to public health it would seem prudent to keep some measures in place rather than this guff about ‘freedom day’. The capacity to overwhelm the health service is still there, the capacity to absorb too much public health resource and starve other treatments is still there. We have too manage this risk in the absence of hard data which means a degree of prudence and public education which talk of ‘freedom day’ undermines.