What's your minimum viable digital camera?
My Minimum Viable Digital Camera 2.0 would be (in no order):

1. GPS
2. WiFi to beam your photos directly to the photo sharing service of your choice: instagram, flickr, google+, facebook, SFTP, whatever, with an API or SDK for developers to add other photo-sharing services
3. real physical dials for aperture and shutter speed
4. a real physical dial for manual focus with focus peaking
5. 1" sensor or bigger
6. physical dial for exposure control
7. RAW + JPEG

Notice there would be:

1. no LCD screen
2. no auto-focus

Don't care about:

1. anti-aliasing filter or neutral density filter as longs as the pics are good
2. lens: 28mm, 35mm, or 50mm equivalent or even a f2.8 or faster constant aperture zoom
3. fast aperture - a constant f2.8 or better is fine

I could probably live without GPS and WiFi but then it wouldn't be a 21st camera would it :-) ?