That's the thing though, they wouldn't be killing off anything except the $500 sensor shell. A DSLR is literally a lens platform. Let apple sell the razor, they can continue selling razorblades.

Sell a "case" that holds and attaches lenses for a hundred bucks or so, bundle it with an app, and allow people to continue using the same lenses, which they make more money on anyway. Commercially, this would be a huge win for whichever of the camera giants decides to do this first.

Additionally, under this model, the cost of the phone + case ($800 + $100) is higher than the cost of the DSLR sensor by itself (which runs about $600 new), so it doesn't necessarily make it obsolete, but it gives iPhone owners a lower barrier to entry for DSLR lenses, which I would imagine would drive lens sales quite a bit. I really don't see a downside here, if it's possible on a technical basis

Is it possible where cameras simply become so good on devices, that the next hollywood blockbuster is filmed on an iphone?

I know that is ridiculous, but I remember a "1mp" camera was advertised everywhere as a thing for a phone to have. It wasn't that long ago really.

Let's say your 2040 Iphone captures 4000mp of the entire visible scene. Then you have some special software that unicorns everything into amazing sauce.

I know this is all pretty whimsical, but none the less, I feel that the path we are going down is one that Nikon and Canon can't finish.