Proof of vaccination looms as a travel issue - but should it be a requirement?

Will there soon be a 'Yellow Card', or Carte Jaune, for Covid-19? And will it allow people to travel any sooner?

https://www.independent.ie/life/travel/travel-talk/proof-of-vaccination-looms-as-a-travel-issue-but-should-it-be-a-requirement-39937744.html