In order to 'stamp out' TRSS and the like it would require a concerted and very well organised 'NO' from each and every young(ish) person out there seeking employment with an airline.
The airlines would have absolutely no choice but to change their policy.
The same principle applies to recruitment charges like simulator assessments etc.
It would be genuinely marvellous if it were to happen and go some way to restoring this industry to what it once was, but who's gonna organise it?