BM is not a camera company, their core business has been producing studio equipment supporting the acquisition of video data. If you look at their product catalog that is what the vast majority of their products are. The cameras are recent, I would guess because they saw a niche in the prosumer market other companies were not exploiting. What they have done is leveraged their experience with gadget manufacturing by taking a generic sensor and sticking it in a gadget. They do not develop sensors or image processors, like the specialist camera companies. The sensors they are using are generic camera sensors (which they probably buy from one of the multinationals, like Sony) coupled with a cooling solution and a data interface. That is basically it. There is either no image processor, or a very basic one, unlike what you would find in any of the pro/consumer models from other manufacturers, which significantly reduce the cost. Instead, that function is offloaded to post.
The sensors on any one of Sony or Canon's cameras could do what the BMPCC does. Even the point and shoots. That reflects the true price point where these camera's should be at. A basic DSLR body in the case of CC, and a point and shoot in the case of the PCC. Sony, Canon et al don't produce products dedicated to raw output because they don't see a significant market there (honestly, we are talking about a small segment of advanced enthusiasts). Raw output compromises the design for the mass market, which mostly doesn't care about RAW, so that is why it isn't there.
If it turns out that there is enough of a market, rest assured that companies like Sony, Canon, Panasonic, JVC and all the rest will produce products for it, and those products will probably be a lot better and more advanced than anything BM can do.
This sort of thing won't happen right now, but 4k products in the consumer market are around the corner and we can expect video cameras that support that to start flooding the market in the next year or two.