When will stage 4 restrictions start to shift the needle?

There's been another grim round of record-breaking coronavirus numbers in Victoria: the highest daily tally, the highest death toll and Australia's youngest victim - a man in his 30s. It's now been almost a month since the state was placed into stage 3 lockdown, and a few days since they were ratcheted up to stage 4. Today on Coronacast, some predictions on when numbers will finally start falling. Also on the show: * What happens with lockdowns if a vaccine never arrives? * What's the success rate on most vaccines?