I'm wondering if the ILC market is moving (or has moved) towards the Playstation/Xbox model, where the console makers make nothing on the consoles but get all the profits from the games, meaning make nothing on the camera bodies but get all the profits from the lenses and accessories. This is because the development cycle on processor chips is too fast and costly for any reasonable ROI, and mirrorless camera bodies are now primarily processor driven (no more mechanical shutter, or increasingly less importance on mechanical components, rather the emphasis on autofocus features and performance, sensor read-out speed and data throughput, higher and cleaner megapixels, raw high-res video, etc. all of this hinges on the processor).
No one but Canon knows the profits for camera bodies and lenses, but if I had to guess, it wouldn't surprise me if the profits are going down on the bodies and going up on the lenses over the years. If this is true, it wouldn't make sense to share their primary profits to third-party lens makers.