The other 150 are either working, on their well deserved annual leave or deployed.
And Dick, please don't patronise me with "Don't you understand this?". I am fully aware that CASA is a toothless tiger at the moment. Regardless of what CASA deems safe or not, where will you get the controllers from? CASA says we must provide an ATC service. Do we? No, not all the time - TIBA.
The stroke of a pen does not change things. I can write a cheque for a million dollars but that doesn't make the money appear. You say you want this and you want that - fine. But you can't just make controllers appear out of thin air.