Quantum mechanics might be a bad model, but over the last century it’s become less controversial and more accepted in the scientific community. The last century has produced more scientists and mathematicians than any other century. I can see a few possible situations.

1. Quantum Mechanics is a fairly accurate representation of the world, or at least about as good as we can come up with given our current state of technology.

2. Quantum Mechanics is a fairly inaccurate representation of the world.

     2a.  Incorrect theories dominating for centuries is a natural consequence of the scientific method and trying to determine the nature of the universe. 

     2b.  Incorrect theories dominating for centuries is a result of an imperfect implementation of the scientific method in our modern society. 

     2c.  The scientific method is incapable of providing humans with a true and accurate understanding of the world.