Since it's only been recently that other practitioners have been able to do this, I expect we'll soon more and that will reduce the backlog.
About 25 years ago, when I first gave serious thought to GCS surgery, the process was a lot more difficult and required a psychiatrist to sign off. Back then, CAMH was known as the Clarke Institute. Of course, going way back, it was the Lunatic Asylum and 999 Queen St. W. was an address you didn't want to live at.