The wavefunction collapse is messy and awkward. It's taken as an axiom, basically, in the Copenhagen interpretation. It's not as awkward as introducing another

The wavefunction collapse is messy and awkward. It's taken as an axiom, basically, in the Copenhagen interpretation. It's not as awkward as introducing another equation and set of rules to skirt around it, as Bohmian mechanics does, in my opinion. Many-worlds - which starts with being a lot more rigorous about what 'measurement' is (entangled yourself with the system in question) is much simpler than either, I think. My general impression is that Many-Worlds is getting more popular as physicists make precise how entanglement, measurement, and decoherence exactly work. I think it'll supplant Copenhagen as what we teach in intro classes eventually. But this is just my impression from the physics blogs and papers I've read; I'm not a physicist myself.