I have to throw my hand in here and say that knowing several of the selection pilots, I can confirm that in true, time honored PPRuNe fashion, a lot of what is being written is simply wrong.
1) The selection team are all current on fleet. There are less than ten of them and all of them have current medicals, and are flying rosters.
2) They get a daily rate of pay for doing the selection.
3) They do the job as best they can to keep the quality of new joiners up, as difficult as that can be.
4) HR do the roadshows, not the selection team.
If they all resigned, who is to say that the company will simply cut the pilot's input into the recruitment process altogether? Remember Ansett? Think what you may think, but don't be so naive as to think that the company won't simply cut them out of the equation if they make some sort of stand...