The past week saw some major shakeups at 'Saturday Night Live.' Will Forte, a cast member since 2002, chose to leave. Taran Killam, Paul Brittain and Venessa Bayer (and maybe Jay Pharoah) are in as -- we assume -- featured players. Yes, it's entirely possible that there are no more changes before the 36th season premiere. But 'SNL' history will tell you that's not likely.

'SNL' certainly doesn't always abide by a formula of "one in, one out," but if recent trends hold, it would appear that the shuffle isn't quite over.

In the '05-'06 season, the cast was composed of 16 members (12 cast members and 4 featured players). In the '06-'07 season, the cast was cut to 11 members -- Rachel Dratch, Tina Fey, Finesse Mitchell, Chris Parnell and Horatio Sanz were all gone and were not replaced. The following year ('07-'08), Maya Rudolph departed and was replaced by Casey Wilson as a featured player. In '08-'09, the cast did expand to 13 members: Amy Poehler left while Bobby Moynihan, Abby Elliott and Michaela Watkins joined. Then, last season ('09-'10), Darrell Hammond left and both Casey Wilson and Michaela Watkins were dropped as featured players and were replaced by Nasim Pedrad and Jenny Slate. So, looking at a five season snapshot, in only one season, '08-'09, did the cast actually expand. If this trend continues, let's see who's actually on the hot seat.