AJ has already said they will likely do just that for international PAX... and I don't expect domestic will be far behind. They may need to wait until there is a greater chance for the general population to have been vaccinated, in line with govt targets. Extending to JQ may be a bigger issue, given the segment and destinations served; I presume though that the frontline staff policy extends to group, and not just QF mainline?
There is some risk of backlash for QF, but if their frontline staff are required to, and given we have >80% percent of the population saying they want to, or are willing to be vaccinated, that's one heck of a market share guarantee, particularly if their competitors don't force a similar position. I would happily pay a premium for the knowledge that no-one on my flight who could be, remained unvaccinated. It would also play well into the 'safest airline' pitch for QF.
Cheers,
Matt.