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...I wonder what a film shot totally on protrait 2:1 (tall) would look like.
Would it fill the theatres just on novelty value alone?
Who knows? Would be worth a try, no? Easily done with any mobile phone or digital cam (and done by most of the mobile phone users when they film something). There is a reason that landscape is the default format for photography, btw
Or you could just put a cache in front of your tv´s screen, to simulate that effect.
If you look at the images, then you might notice that the panel structure would translate into a panning of the camera more than to a 2:1 ratio, since it´s motion that is shown without a change in the position of the camera. So the camera is following the object in front of a background. Think "storyboard image that shows a pan of the fov". You would not want to undercut the sequence of nemo´s bed moving when the framing is always the same, right?
Btw, you IMO can´t look at those old comics and pull them up and compare them to current movie making. You should compare them to contemporary vintage movies. Very static camera positions.
I suggest you read "understanding comics" by Scott McCloud, it might help you get better access to comics.