Well I did not expect the expiry date on the certificate to be more than notional.

I remember the lifetime drivers license.

For 'disease' moderation and prevention for majority it may be quite suitable, even conservative.
Infection not so much of an issue if its mostly a few days in bed, and not loading hospital.

Timing for a possible winter boost reminder ?

Of course certain people apparently knew omicorn was coming and when.
Pity they did not let the rest of us know. 

I can just imagine the horror and backlash if pass was issued with short expiry date. 

Alternative paralyze yourself with a do nothing attitude, nothing to criticize here move along. 

We do see that once people get that first dose the uptake on second is very high, higher than expected.
People in high risk, MIQ, Healthcare, Border can and are being covered separately. 
So more than enough people will probably take up the third anyway.

The Golden Nitcomb award goes to. :-)