But the next 3 odd years, we are just sitting ducks.
Don’t overblow it. Even if they are nuclear powered you are only talking about a platform carry a few dozen conventionally missiles - about the same number Ukraine is being hit by every week. Tactically advantageous but far more politically symbolic.
If you are talking about Australia being protected by a strategic umbrella in the short term, remember the US isn’t solely dependent in subs - and has already signed up to forward base B-52s and B-2s which can be deployed in days, if not hours.
https://thenewdaily.com.au/news/poli...-us-australia/
https://www.themandarin.com.au/20774...r-72-darkstar/