These are your views, which are not particularly reflected in the show: Bubbles spends most of the 4th season being brutalized because he's "too" independent. Hauk is tossed around by political winds, while his friend Carter advances while doing good police work in the context of a larger department. Omar, as another commenter point out, just dies. Bunny is spiked and left out to dry by the bosses, and is mostly characterized by his own nihilism in the 3rd and 4th seasons.

Not all survive, and those that do do not particularly thrive.