They've been working on Saints Row nonstop, literally, since Saints Row 1. When Saints Row 1 was almost finished, or around that time, they started working on Saints Row 2, or atleast announced Saints Row 2, then when that was almost finished, they announced Saints Row 3, then Saints Row 4.
I'm not sure how normal that cycle is in the game development business, but it doesn't sound good for any line of work that requires creative output/inspired workers. It's as if they are just churning out Saints Row after Saints Row cause of how much money the previous games made.