The biggest problem with pilot wave theory is that extending it to field theory hasn't been done (or at least there's several published formalisms with no approach that everyone agrees upon). Right now its useless for practical physicists at the LHC to compute anything about collisions. Its mathematically equivalent to the other mathematical formulations of QM, but the only utility it offers so far is entirely philosophical. And at some point physicists don't spend their entire lives noodling on the underpinnings of QM and need to move on and really try to compute the g-factor of the electron, or analyze the collision data coming out of the LHC. There needs to be a Lorentz invariant field theory model of pilot waves that can answer some question easier than the other mathematical formalisms for it to catch on.