Jimmy Smith is currently on the UFC's radar. Bellator informed him before the new year he wouldn't be getting his contract renewed. Joe Rogan is a fan of Smith's and wants him to join but the casuals might not be able to tell them apart.
In this interview he clarifies that he's stepping away from refereeing while he's going to be working for Bellator but leaves himself the option to return later on. So, typical combat sports retirement.