Why would it? 2017 championship games featured Foles/Keenum/Bortles/Brady and Foles ended up being the last one standing, that didn't change anything about the narrative.
The outcome of one individual season can never change things, that narrative is about how you look up over an extended period of time and the teams constantly in the mix typically have a QB who's anywhere from very good to great.
There's new factors at play now, and what some people gloss over is that those constantly in the mix have a Mahomes, Lamar, Allen or Brady. A GREAT QB is an absolute trump card, but there aren't that many truly great QBs in the league and usually, the same QBs are the ones waiting at the end.
We're watching Mahomes and Lamar come up short right now. One guy in the NFC constantly in the mix (Hurts) is considered a product of his supporting cast by many.
But the current AFC picture has one objectively great QB in it. The rest of the field have decent to good QBs who may be having great years.