I think you imagine a usage for DSLRs that's vastly different from reality. I could and often do fill an SD card without ever interacting with the software on the camera. This will continue to be the case unless something major changes to flip the balance between what's possible on a tiny battery and what's possible with 6 cores, a wide range of software that can do anything the iPhone does, and an essentially limitless supply of power.

Even the stuff on there already uses too much power. Nikon's SnapBridge uses BLE and still cuts how many photos I get on a charge by 90%. That's without spending any time doing anything in the camera's software. I turned it off so I didn't have to charge the battery after going out for a walk with the camera. And you think I want to do more on that battery?