This is one of the reasons we haven't pursued this - trying to run more than one class in the shop just isn't doable due to noise levels.
Second reason, is that we require training of all instructors, and I doubt this will be changed ever. All instructors are required to teach WSB from the syllabus, and that's important, since it gives us at least some assurance that they've been exposed to the program fully. Piecemealing it up, is unlikely to improve instruction.
Lastly, this is a cyclical problem we've dealt with many times. Periodically our instructors get a little busy, and the schedule thins out, then get back at it, and schedule gets fat, etc. Never the less,our current system has trained an enormous number of people, and continues to do so. So getting exited during a lull and rushing in with a wholesale change to fix something that isn't broken, isn't really helpful.
Moreover, we still have a severe problem with no-shows tying up the available slots, and that's a more serious and difficult issue to deal with. It's common to have 2 or 3 people out of a 5 person registration show up, even with the $5 class fee we charge.
We've had 2 or 3 new instructors volunteer to teach, and they are at varying points in their training, so the schedule will be back to normal shortly (actually, it already is), so I don't think any additional action is needed or helpful at this point, unless it addresses the no-shows.