If people consume "credible bullshit" and can't tell the difference, without consequences, then your thoughtful work isn't as valuable as you thought.
If on the other hand people consume BS and it comes to bite them in the ass (through reduced socioeconomic status and, ultimately, reduced reproductive success), then competing approaches become viable.
We may not be around to experience it – a variation of "the market can stay irrational longer than you can stay solvent" – but you may find comfort in the fact that Nature has a way of optimizing away cruft. Most often through repurposing the obsolete-but-already-existing system for another function, and failing that, through atrophy and death.