Off a cliff implies they are no longer a factor, which couldn't be further from the truth.
Well, some are going to prison. I suppose it's true that you can't kill a bad idea, but can you still call it QAnon without Q? When Trump lost the election, the insurrection faceplanted, and Q moonwalked into oblivion, it was definitely the end of something, even if it wasn't the end of toxic stupidity on the whole.