Since the beginning, my money is on that pandemic restrictions will be over somewhere between Christmas (assuming it will be canceled) and the first sunny days of spring (in the northern hemisphere, that is). At that point, people will have already lost too much that a "potentially getting Covid" will be more acceptable than "loosing something with certainty" (economically, psychologically, etc.)
Vaccine or not, Covid is not going away but people's patience will. You cannot live under fear forever. At one point, if nothing bad happens around you, you don't throw away your life for some hypothetical outcomes. Or if they happen anyway despite your best efforts.
Once there will be one nation who will be fed up (the people, not the government) and quit, it will have a snowball effect on all others and no governments will be able to stop it. Never underestimate the human factor.
If the experts were right and a hecatomb does happen afterward, the restrictions will come back on their own, but this time they will be self-imposed by each individual, based on facts and not pessimistic statistical models; the way it should have been all along.
Just my 2¢.