I don't know what type of leaves Horatio has been blowing but I never heard so much crap since GB junior told the world he knew Iraq had WMD.
What is the main difference between a PPL and CPL? A bit more involved theory of flight and systems (but not more than a LAME), a bit more flight training for accuracy ( but not more than CIR or aerobatic rating).
So on that scenario nobody should instruct anyone until they are first a LAME with a CIR and Aero rating!
Let's be honest the main opposition of the idea is those that think their livelyhood is threatened. That fine but say that ,not try and pretend PPL's could not do it just as well, if not better, if they have the experiance.