Except there would be no jobs. If you effectively treble the staff costs so few people would do PPL’s that most schools would go out of business. People are so mobile these days that wannabe PPL's would go aboard unless the price hike was international. Where then would the hours builders hours build other than by paying for it themselves. A bit of a pyrrhic victory perhaps?
Such action may however lead to an upsurge in the number of PPL instructors instructing on a PPL, the one thing all new FI’s seem to hate with a vengeance!