Both the travel industry and politics are currently concerned with the question of how travel will work after the nationwide availability of corona vaccines. It is possible that in the future you will have to show your vaccination card before departure or during border controls in order to avoid entry harassment.
At the G20 summit, China made a different proposal: vaccination certificates, health certificates and, if necessary, corona test results should be stored in a global database and presented via QR codes during controls. The communist country envisions that this could create fastlanes upon entry. Given the high level of mistrust of the regime's data protection, it is extremely unlikely that the Chinese proposal will be implemented internationally.
Nevertheless, the Chinese advance shows that a solution must be found. There are currently some indications that the vaccination card and / or a certificate that you have been vaccinated against Cov-Sars-2 could play a decisive role in the future. For example, Alan Joyce, CEO of the Qantas airline, said that international traffic will only be able to carry passengers who can prove a corona vaccination. It remains to be seen whether this statement is compatible with Australian law or that of the respective destination or departure country. At the moment this would not be possible, otherwise it would be discrimination.
But what is and what is not discrimination is primarily determined by politics and later, if necessary, by the courts. Put simply, this means that it must now be determined at a political level whether people who are vaccinated against the coronavirus will receive relief in travel or whether proof of vaccination could be binding. Most likely it would be for the European Union to stipulate that nationals of third countries are only allowed to enter if they are vaccinated.
However, it will be very difficult to find a uniform line within the EU. Many states rely on voluntariness, in others one tries to enforce compulsory vaccination. Since the members have not yet been able to agree on uniform travel rules, and since each state continues to cook its own soup, it is not to be expected that much will change due to the availability of vaccines.
In any case, Austria wants to negotiate at the EU level, because the Ministry of Health expects that some countries will in future demand proof of a corona vaccination when entering the country. There could possibly also be electronic documentation, whereby Austria is betting that a coordinated approach will be chosen. How sensitive data can be processed in compliance with data protection regulations is another matter.