There is already a way those who could lose their class 1 can still instruct - its a dispo that allows them to fly with or as a safety pilot.
Its a commercial job leave it that way.
Raise the bar for low time guys and gals, make them have 500 or 1000 hours to instruct - I'm not really fussed about that - but I'm talking about knowing that you are paying for a standard, a certain level that has been obtained.