The French are still promoting their sub, though local political influencers. So there are a lot of option B stories, from X-PM Turnbull down to bloggers. This will continue. There is no Gov support from both parties for this option.
If by chance we don't get the Virginias as a stop gap. We will wait for SSN-AUKUS, early 2040. The Collins fleet is fully retired in 2048, at this stage. Not getting the Virginia may extend a few. The US want to forward deploy subs in Australia.
That will still happen, as it is in the US interests.
My personal opinion is it would be a cost saving to Australia. It would be in Australia's interest, to have only one class of sub.