I reckon that towards the end of the next Spring things will start picking up slowly but steadily with more vaccines becoming available. I think it's fair to assume that big players like Ryanair and Wizz will have some places for cadets in 2022. Whether you like it or not, for several reasons, there will always be places for cadets.
And if the vaccines don't work, well, we have to go back to some sort of normality at some point but that will take much longer. And I don't even want to think about this outcome.