In recent years actors like Shemar Moore and Thomas Gibson either left (or were asked to leave), but in general, it’s been a nice, long run for the main cast.
That’s a super long run and for much of that run the show featured a main core cast that audiences could identify with.
And many of the actors that have moved on easily found work elsewhere, thanks to building a reputation in many cases on this show.
Criminal Minds has been on the air for 15 seasons.