[miro]

Smartphone can't really kill system cameras. Long tele lenses are pretty much impossible unless you compromise the size of the smartphone.
No viewfinder either. Admittedly they've come far with the bokeh effect so fast lenses may not be an issue anymore. The sensor size is though.

I tend to disagree with you.
 - one of the main photography rule is to be at the right time at the right place.
Initially I underestimate the smartphones. I was thinking that Shallow DoF portrait is PRO area.
But look what AI, and new smartcammera techology is doing - /Anyway not my teste but good eought for 99% of population/
Telephoto what can I say
 - Historically seen telephoto was small format camera territory. Large and MF dont have it
 - I have dSLR and I had two telephoto lenses. I sold 400/5,6. And I dont know when I have used telephoto for the last time. Maybe because I use 150/macro pretty often.
Viewfiner
 - I agree that screen is bad. But looking back
https://www.flickr.com/photos/[email protected]/
This camera has the best viewfinder

@JJ_SO - agree that camera wil become niche for small group of people that likes high fidelity and pursuit perfection. Personally I have done similar thinks with the audio equipment in the past. Huge speakers, Special room etc. But who wants this thinks nowadays, sure if you are married and have family. no one wnat it at home :-)