I think the succession plan was put in place a while ago and the details came into focus more in the past 2 seasons. I don't think this was a knee jerk type decision based on the season we had. and how did we get Gute? He's been working his way up for a couple decades now and in the past 5 years him and 2-3 other guys have been linked as possible GM's to take over as internal candidates. I know fans were all "Wolf, Wolf, Wolf" for a few seasons, but Gute was linked right there with him. They gave them their shot and picked the one they thought would be best.
I think the season did play a role in a new DC obviously. Capers, for me anyway, has been difficult to figure out. He's not dumb. He can coach a defense. There have been different reasons for not having the success they wanted. But the past 2 seasons have been a lot of the same. Busted plays, busted coverage, big 3rd down plays, over and over. Sure they had some stops along the way, but it was consistently bad and with different players. But now had the defense been in the top 12 or so and done better, i'm not sure we would have seen the change. But a new GM? I think that was coming and in the works for a couple seasons now. Maybe it got bumped up a season, but i don't think it was a decision made because of how last year finished at all.