Luke, I have often thought about setting up an aviation training aptitude test (but I'm not qualified to do so) which would be voluntary but would give prospective students an indication of their suitability to train as a pilot. It would be mainly for those who aspire to be airline pilots. Most students could get to CPL level if they pulled finger but some are unlikely to get any further from my observations. This may have saved them the trauma of paying back horrendous loans. I can see your target CFIs loving that idea.