JSWOC went as part of a saving demanded of the Defence Academy. My understanding is that it was a decision taken with much regret, but deemed to be the least evil of available options.
Excuse my cynicism but for me 'least evil' = 'easiest' and can be interpreted as the poor regard that WOs, and their development, is held in comparison with their lords and masters. Especially so when measured against the cost of running the many (and in some cases lengthy) staff & E&D type courses that are run by the Defence Academy.
Just how much has been saved by this decision? A couple of full time staff; costs of the visiting speakers? Surely T&S is covered by the student's PU and would not affect the DefAc budget. Poor call IMHO.