Who knows what the politicians may decide, but the science offers some good news.
A vaccine will have to reduce the risk of death or being on a ventilator or infection others by more than 50% - that is what the US FDA has decided. Hit any of those and you get an emergency use authorisation if the vaccine is also safe. Now that isnt very good for aviation as many countries may baulk at reopening their borders with still a 49% chance of visitors bringing in the plague. However some studies last week suggested just the first of the 2 doses of vaccine we will get stops the virus replicating in the nose. If true we may see a covid vaccine certificate like the smallpox vaccine certificate 40 years ago that allowed the vaccinated to travel
I am a glass half full person but I do believe the tunnel isnt that long and we will see the light. I know how important that is for so many on this thread.