Virgin will still have a need for large number of pilots from GA, MIL and Regional. Company is saying only a small number of cadets will be employed each year. They will not put cadets into the RH of any jets until they reach an appropriate experience level.
Regarding the Skywest Captains seeing the cadet FO move over to Virgin, well if they had of been smart and allowed the Virgin Australia pilots who wanted to go over to the ATR via the EOI, then a door would have opened. Now the door is closed and there will be no short cut for them.