This, Car.
I mentioned in the Monday GDT, these refs hold full-time day jobs (CEOs, private school principals, attorneys, to name a few) and then have to jettisone to the game after their work week is over. They make ~$200k a year ref'ing. Gooddell needs to double that wage and implement them full time, even during the offseason, so that they get constant training. Doing this will result in a crisper officiating crew, and allow more checks and balances (i.e. fines and firings for ineptitude).
Mike Pereira spoke on this recently on The Herd, but I largely brushed it off as him being a talking head for the League and officials.
Still, I completely agree, Car. The NFL makes billions, they can afford full-time refs.