Steve, I totally "get" what you are saying, and I agree with almost everything you say. Please let me offer my ideas of what lies on the other side of the coin. In some industries, getting people to "jump ship" NEVER occurs in significant enough numbers to benefit a new entrant in the marketplace. Ford vs Chevy, Jim Beam vs Jack Daniels, John Deere versus "the red brands", Macintosh versus PC, Packers vs Bears, Yankees versus Red Sox..there actually are many longstanding allegiances that no amount of marketing, not even hundreds of millions of dollars and literally decades' worth of hype and PR and advertising, can overcome. Some allegiances, formed early, last a lifetime. A head start is worth a hellll of a lot in most races!
The camera market is divided into the traditional "camera maker market" segments, as well as the newer, consumer electronics market segments. For some people, a camera is a cam-er-uh. For others, it is an electronic gadget. Sony has entered a market that has had a number of companies that had been in the camera market segments of the business for many decades. Sony entered a market where Nikon had basically, a fifty year head start in Nikon F-mount lenses, and a legacy. Sony entered the "serious camera market" segment of the business after having been in the lower-end P&S digital business for a few years, when they bought up the serious camera intellectual property and the lens mount of a bankrupt camera maker, the smoldering ruins of Minolta, which went +i+s up and sold out to Konica, which formed Konica/Minolta; Konica had been an old Japan based camera maker-OLDER than Nikon, but it too had gone +i+s up...so...Sony tried to buy its way into a legacy-dominated camera segment with the wreckage of TWO failed traditional camera makers, Minolta, and Konica, neither of which could handle the competition from Canon and Nikon.
Let's say I am Donald Trump, and I want to start my own world-wide soda pop company. I plan to dethrone Coca~Cola brands, and Pepsi~Cola. I have 977 million dollars for advertising. Know what? I have a snowball's chance in hell. This is what Sony is trying to do, in a business where the products are **expensive**, and there are older, more-established brand names, with resale outlets for older, discarded equipment, as well as millions of legacy lenses and accessories for sale. Even though Sony severely cut prices on its d-slr offerings, like the A900 24-MP FF camera at $2499, and the A800 24-MP FX d-slr at $1899, the $7,999 Nikon D3x outsold both of those very,very nice, beautiful Sony cameras. All three cameras used the same Sony-made sensor. Sony has tried to "buy into" a very exclusive, mature camera market dominated by two much older, legacy camera brands, with the idea that the industry is just a niche within the consumer electronics business. News flash: not all of it is consumer electronics.