Marty, even Nikon is not a pure “camera company”; they also make high grade optics for other uses, from eyeglasses (hell, my eyeglasses are Nikon, I should know) to steppers. Only Leica is a “pure camera” company and, for the time being, its special niche is secure, particularly with the help of Panasonic.
It could be reasonably argued that most of the market consolidation has already happened: Canikon, Sony, Ricoh, Samsung, Panoly, Fuji, plus a few lens specialists.
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.