The idea certainly makes sense. It appears that the WM is essentially an overpaid non-job. They don't have the authority to make any decisions without reference upwards to the DGM or sideways to the ORO, and how often are they actually around? It seems their main function is passing down the bad news from above - few copies of a newsletter would be far more cost effective.
And why do we need two DGMs? Surely a GM and then ten Watch Supervisors below would make better sense (and save enough money to re-instate sandwiches at those watch briefings that always are scheduled for lunchtime!).