I see the choice in digital to be reduced- in terms of what is affordable, the there is only 2x3 aspect in full frame and if you want 4x3 aspect then its some mirrorless thing i have no interest in.
In medium format same thing, 2x3, 4x3, and not affordable....
So, 1x1, 4x5/6x7, 6x17 etc...all of that lovely stuff is consigned to the waste bin of history. Except if you like film, so I'm happy.
please no one say crop or I'll have your head
Well, I most often have my E-M1 set to capture in 1:1 format... It's not cropping if it's the format I see through the viewfinder and I'm framing for it. Same for 16:9. ;-)
No, you're not going to get the larger format sensors without spending a bunch of money. And you're not going to get 6x6 or 6x7, etc, even then. But that wasn't what I meant.
The format choices in digital cameras are just as broad but the format sizes are all smaller. Where the differences lie beyond that are in the strength of AA filters, the pixel density, sensitivity, and noise characteristics of the sensors, and the lenses available to use.
My digital cameras at present are iPhone 4S, Olympus E-1, E-M1, E-PL1; Leica M9, X2, X; Ricoh GXR+M, A12-28, A12-50; and Sony A7. My lens kits are FT SLR, mFT, Leica M-mount, Leica R-Mount, Skink pinholes, Holga toy, and Nikon SLR. That's a pretty broad range of different formats, sensors, and lenses to work with. Each combination produces different results. I even have true oddities like the Hasselnuts back for the 500CM, which nets Hasselblad imaging into the iPhone 4S camera. I don't see too much reduction there.
And when I want to go even further, I take some film out of the fridge and shoot Polaroid, 35mm, Minox, and 6x6. I don't really need much more, it's all good.
G