But you need to have good products. To support a company or an industry that is sort of paddling and going around in circles, may not be very helpful.
In this case the industry was strong, the people were well trained, and the factories were well equipped. They had a product, the Challenger, eventually the regional jet, and de Havilland had the Dash 8, and these products were of very high quality.
By preserving these aircraft, getting them under way, it was very successful. But you need the products in order to justify saving an industry. If you don't have the products, there is not much point.