Not wishing to contradict you in any way Coathanger and for years ahead, a document may need to be carried when in close proximity to others to say if one has been vaccinated or is immune. A new order of things and a change to life as we currently know it.
Whilst the pandemic is ongoing yes, but as I said it will "end" in one of two ways.
If a vaccine is found, then yes you could probably expect to only be allowed to travel if you've had the vaccine - and governments would do their best to roll is out as quickly as possible.
How long do we wait for a vaccine though?
I've heard in the last week or so a few experts say a vaccine may never be found, that Covid-19 is here to stay, and it will just be a case of living with it - much like we do with the flu. Will any travel restrictions imposed now still be imposed in 12 months time if we're no closer to finding a vaccine? I'm happy to forego a summer holiday this year if it helps stop the spread of Covid. Not convinced I'd be happy to lose next years summer holiday as well.
If documentation is required to travel proving that you have had Covid and that you've recovered from it, and are therefore immune (another argument entirely *), how long will it be before people start going out and trying to deliberately catch Covid?
If a vaccine proves impossible to find, it may be the case that we go back to "normal" but governments across the world actually invest more in healthcare to provide the capacity for more people suffering from Covid.
What happens to countries that manage to eradicate the virus without a cure?
Greenland for instance had just 11 cases, all of which have recovered, out of a population of 57,000. The last new case was over a month ago, so it's likely there is no Covid in Greenland now. If a vaccine proves impossible to find, what happens to those 56,989 people in Greenland who never caught it?
Australia and New Zealand seem to be on course to eradicate the virus with no vaccine. Australia down to 590 active cases (vs a peak of 4935 active cases). New Zealand down to just 65 active cases (vs a peak of 929 active cases).
* this virus hasn't yet been around long enough for us to know whether having it and recovering provides immunity. Much like the seasonal flu, it may be that each year we get a different strain of Covid and therefore immunity lasts only until the next strain starts to spread.