Let's be honest - they're as much use as a chocolate fireguard.
A vaccine passport doesn't stop the spread - be that on planes or in large venues etc, so will we go back to testing?
Yes it's a pain in the backside, and it's easier to whip your phone out, but testing is currently massively more reliable at finding infected people than relying on a QR code which doesn't actually prove the person is negative at the time of them attending said event/journey.
I really am struggling with their effectiveness in trying to stop the spread.
Will we really need them for the foreseeable or will they admit they're not fit for purpose?