One possible scenario that may cause poeple to leave (or want to) may go a little like this:
A particular cadet/s transfer to another fleet (direct to command), glide in thinking they know everything, start transferring their bad habits to other easily influenced cadet F/O's and by pure nepotism find themselves in a position of political influence. Then those captains who actually worked their way up the aviation ladder get pissed off at having to regularly rein in these cadet F/O's who ,by no fault of thier own, believe SOP's were never meant for the brave and that they have a "better" idea that they saw the other day to make the operation a bit more "awesome".
A pretty hopeless situation for those trying to keep the priorities in order, yeah I think an exodus could begin there.
Just a random thought
