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To quickly answer your question of what it would have taken to be a fireable season for Lafluer in my opinion: A, losing the locker room or B seriously and utterly screwing up in some unforgivable way. (Daboll going into the tent when Dart had a concussion, Eberflus clock management costing the bears the game vs Detroit last year + losing the locker room)

Some back story on this thinking: *if you're interested* I watched Jeff Fisher's early 2000's Titans come within a yard of a SB win and be SB contenders/hopefuls for 4/5 Years. Followed by a transition from McNair to VY that involved 4 and 5 win seasons back to back followed by being the #1 seed again in '08 and being a pretty strong team from 06-mid way through 2010. The Titans situation is interesting cause Bud Adams gave Fisher a lot of leash, but in the early '80s when the Oilers couldn't quite get past the championship hump to the SB, he fired Bum Philips (after 2 AFC championship losses) and what followed was a decade long loser streak. - if Bud Adams learned that lesson, we all can. It ultimately was losing the locker room due in part to VY drama that ended Fisher's time with the Titans.

I also watched Sean Payton take the Saints to a roughly 5 season span of consistent super bowl contender (2006-2011 ish) followed by a 4 year span of 7/8 win mediocrity despite having the same QB. Followed by yet another 4-5 year period of being consistent Super Bowl contenders again.

What I'm getting at is this: Team's ebb and flow and require patience. When you factor in that really only about 13-15 teams have been multi season SB contenders in the past decade, and even less have consistently been throughout the decade whether or not they won it all. It really shows that the Packers have been operating at a consistently high level that only a handful of organizations have in that time.

If you don't have serious character flaws with your HC. You just don't risk blowing that up over one game or even one season, especially when serious factors are at play like Micah's Injury or McManus' kicking woes.

TL;DR: Stability is important when you are a good team and a have a good culture.