Reading it I think his comments are perhaps in places valid but obviously a bit "Aussie centric"/aussie specific ("Union verses Scab" rings bells about a specific labour dispute which rightly or wrongly still hits a nerve down under).
I think in general and overall as long as there is a supply of those willing to pay money to train right from the "get go" (which he sort of strikes a glancing blow at with "problem #3) I don't think there's any chance of a significant shortage in the forseeable future.