If you want to do digital with a view camera, you should consider 6 x 9, not 4 x 5. There don't seem to be any full frame 4 x 5 digital backs.
I recently posted a similar question and after everything that people suggested, I got myself a Nikon D800. It is a full frame 35 mm digital camera which produces a 7,360 x 4,912 image, or 36 Mpx. Of course this is a Bajer array rather than one having RGB values for each pixel, and you can do considerably better with a 4 x 5 camera, but it is still good enough to make 16 x 20 prints indistinguishable from those made from a 4 x 5 frame.
It doesn't have all the features of a view camera, but you can get tilt-shift lenses which provide many of those features. In addition, because of the smaller format gives you so much more depth of field, you don't need tilts and swings as much using its normal lenses. So the major lack, as I see it, is not having rise/fall and shifts with the normal lenses.
I don't plan to abandon my 4 x 5 view camera, but I scan my 4 x 5 film to convert to digital.
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