Nothing - and if you'll look at the various "assessment system" threads I've started, I've no problems with such a system. In fact, I'm an advocate of it, I think it's a good idea.
But there are practical problems - i.e. most people booking for a workshop in the UK won't be around to dance with that teacher, they're likely to be at different classes.
So how do you get the potential students and the assessor (the workshop teacher) in the same place? You can't, it's a logistical nightmare. Especially for specialist workshops, where you may only have 1 or 2 people per venue who are interested.
So to make it work across multiple venues and franchises, you'd need an assessment system, standardised, across the board, so you need to train all teachers in assessment criteria, and so on.
It sort-of works with Jango, because it's done on such a small-scale, and because Jango attendees are pretty much self-selecting anyway. Implementing it on a larger scale would take a lot of work, and probably involve a culture change in Ceroc in the UK.
From a commercial cost / benefit point-of-view, it's not obvious what the immediate gains would be.
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