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In reality even if the vaccine is produced, you'd need the best part of 500M produced just for the EU let alone the other countries along the route. It won't be a case of individual risk as it would be today, it will still be whether countries have sufficient immunity built up to allow free movement again.
Good news on the vaccine today, maybe it will go ahead as planned:
Life should return to normal by spring, says UK vaccine expert
https://www.theguardian.com/world/live/2020/nov/09/coronavirus-live-news-us-nears-10m-cases-as-global-infections-pass-50m?CMP=share_btn_tw&page=with:block-5fa944248f0870a6e75faf8c#block-5fa944248f0870a6e75faf8c