By second half as in by July? Or ‘in’ the second half meaning perhaps October- December? If you’re right the A380 is back in business within 6 months of that occurring.
With an Aussie populace almost fully vaccinated by Christmas 2021 and similar occurring in the UK and the USA there is no way the public will put up with an additional 12 months of locked borders and quarantine.
Would these be the same epidemiologists who predicted massive first and second and third waves and how allowing gatherings in NSW at Christmas would see thousands of cases by early January? The same ones that claimed the cricket at the SCG was going to be the mother of all super spreaders?