What you are describing is a large depth of field, which just as attainable using analog as digital. Of course, it is easier to FAKE a small depth of field using a digital source that has measures of DISTANCE for all points on the image... which are NOT entirely present in 3d photography, but which can be sort-of "guessed".
Now unfortunately, this approach doesn't yield good results... specifically, you obtain a large depth of field using a small aperture. A small aperture means less light and more diffraction, which generally reduces the image quality, which means that you can't blow it up as much -- which means no imax theaters since it would look like crap when blown up to that size.
And then there is a whole bunch more complexity.... http://en.wikipedia.org/wiki/Depth_of_field