I don't think
vb will ever buy anything from Embraer ever again.
Yes I am sure that would make the 500 Virgin fo's very happy ....
Suspect the majority wouldn't go back to flying a turbo prop in a pink fit. I also suspect it would be much like the current system: Can get a quick command on Ejet or wait a decade or more for the 73.
If you look at QF they have very experienced FO's that sit and wait. I suppose there is no other option.