Whilst true, not really part of the question. McVay was never mentioned as a defensive genius. He built his resume on offense and you really can't get a more safe hire than Wade from an historical perspective. It's also true that Goff's ineffectiveness did nothing to support the defense. I saw a QB who didn't have a clue.
McVay may rise from the ashes, or he may end up being another square peg kind of coach. I heard recently that LA has an out on Goff's contract that won't kill them financially. They'll be wise to use it.
Not to go too far out on a limb, the Rams illustrate why it's imperative for a team to get to the promised land whilst the QB is on his rookie contract. As soon as all of those dollars are tied up in that one position it becomes much more difficult to put a solid team around him. Every personnel mistake is magnified.