... but if you look at the actual market, the money is made in the pro enthusiast environment.
The market reports I have seen are that (a) Nikon's top selling DSLR by both units and revenue is its cheapest, the D3400.
(b) Sony and Nikon both have about an 8:1 ratio of 24x16mm to 36x24mm format ILC camera bodies, and with the price ratio far lower than 8:1, the smaller format is clearly where the great majority of revenue comes from in their ILC sales.
All companies are moving to it since some years.
Most companies are addressing the more expensive sector, but that is very different from the idea of abandoning the mainstream formats where the majority of revenues come from. Looking at model release history in recent years, there are consistently more "sub-35mm" format bodies than 35mm format ones, even if considering only the brands that have both. Including Olympus, Panasonic and Fujifilm, the preponderance of the "sub-35mm" format model releases is even more clear.
This whole "only full frame" prediction is like claiming that Lexus models are more profitable than Toyota-branded cars and so Toyota will move to making only Lexuses. As I mentioned elsewhere, even the ultimate luxury brand Leica has both 24x16 (CL and TL) and 36x24 (SL) EVF camera models in its L-mount series.