Sadly Geoffers, I don't think we are
As you well know, military instructors are checked every year (at least) and any period away from instructing would require a full assessment by their new unit. There is also a professional progression (B2 to A1) which allows employers (OCs) to assess the suitability of a candidate for a particular position.
Perhaps when such a structure is mandated in the 'real' world then standards will rise but, unless a new FI is lucky enough to be taken under the wing of a good mentor, they are pretty much left to rely on good luck.