- Given that Bohmian mechanics (better named de Broglie-Bohm or dBB theory) contains the Schrödinger equation, it contains quantum theory completely, and therefore all things which make sense in quantum theory remain meaningful. Of course, for quasiparticles nobody plans to construct trajectories.
And it is also not possible to simply "watch" Bohmian trajectories.
- dBB theory is usually presented as a theory for particles, but this is far too restrictive. The better way is to present it as a theory for the configuration space: It defines a trajectory for the configuration $q(t)$.
So, the configuration may be, as well, a field $f(x)$ on the space. Then the "trajectory" is $f(x,t)$.
The mathematics of dBB theory works if the Hamiltonian has the form $H=p^2 + V(q)$. This works nicely with relativistic field theories $L = (d_tf)^2-(d_xf)^2$ + interaction terms gives momentum $p(x)=d_t$ $f(x)$ and gives a Hamiltonian quadratic in $p(x)$.
All the advantages provided by dBB theory do not depend on the question what is the particular configuration space. Thus, they would survive whatever the choice of Q is. All one has to care for is a way to obtain a choice of a configuration space so that $H=p^2 + V(q)$. For bosonic field theories no problem, for fermionic field theories proposals exist too. In the worst case, one can consider partial realizations (like defining trajectories only for bosons). This is less beautiful but preserves the major advantages (realism, causal explanation, no measurement problem).