Its been shown that the 2nd jab will lose effect over time. Generally 4 to 6 months after a booster will be required.
What seems to be missing yet here in Australia is the preparation for these 3rd shots.

I personally suspect that we will start to outbreaks in Nursing homes again (as these were generally the 1st to get 2nd jabs) which will be seen to be the start of another wave.
Whilst I doubt there will be another full lockdown in NSW, there might be a closure of some industries/retail/services.

Looking more outward, I really wonder what has become of the other mutant strains we have all been warned about, such as mu ?

For those who haven't been following, Israel has rolled out its booster and anyone not having a 3rd shot or actual covid within the last 6 months loses their green pass.

We have an interesting 6 months ahead.