I have nothing against training; however, I disagree with it being compulsory.
You aren't required to go to a driving school in order to get a drivers' licence. You only have to demonstrate proficiency at the wheel.
Drawing from a holster and moving with a loaded firearm is not 'rocket surgery'. A competitor just has to keep the gun pointed in a safe direction and keep their finger off the trigger until the sights are on the target. And every shooter gets their own personal RO/SO to supervise them while they do!
As for the rules of the game, a person can read the rule book and/or watch someone negotiate a course of fire before attempting it themselves and do just fine; particularly in IDPA where the CoF is more choreographed than say in IPSC/USPSA. They will probably go slower than the more experienced shooters but will more than likely do it safely. In fact, this happens all the time at most of the matches in the US and more than a few in Canada.
IIRC, the only time in Canada that an IDPA shooter had an ND that resulted in personal injury was in Chilliwack a few years ago and it was by an SO
instructor that was certified by none other than Canuck44!