With 3d printers and print on canvas technology etc, digital art can and will look as deep and 3d as oils. Imagine John's abstracts as 3d "paintings".
I've yet to see anything that comes even close. I've seen reproductions that mimic the impasto surface of paintings but not the transparency or physicality. Such technology would also be expensive and largely limited to wealthy artists... especially as the scale of work increases. It is certainly possible that future technology will be able to mimic paintings to the point that one cannot discern the copy from the "original". But it has always seemed to me that each new innovation in terms of creating images has been embraced as new media with its own possibilities and not simply a means of mimicking other media.