unless an effective vaccine is developed and distributed before then none of us will be allowed to leave (or likely want to.)
Where did you hear that? I haven't heard anything about Australian borders being closed until a vaccination is available, although I've seen media reports speculating that the borders may not open until next year. Who knows if it'll happen in time for the Convention?
I agree that there are people who would be uncomfortable travelling until an effective vaccination is available.
Here's a link to Brendan Murphy when he was Chief Medical Officer saying it as well.
I had four international trips booked before end of 2021, I can't see any of them going ahead unfortunately.