I think Xulu has it pretty much sorted.
If Emirates was to go to 2019 levels, that will mean recruiting another 1000-1500 pilots in 3 years. But they don't need to. Not all the A380s are coming back, some B777s are still leaving, and the B777X are delayed. The 787s are inbound, so that will need pilots, just not Airbus pilots.
In the short term, I would expect as many guys on UPL who will come back, will be back by mid year. After that, recruitment and upgrades will continue as the company sees the need.
As much as I dislike and distrust certain management, by and large they have done what is needed to keep the company safe, so they are not idiots. And the recovery will be managed with the same ethos in mind, looking after the company.