I think that while we've long had mobile display devices, other commenters have already brought up the utility of physical texts versus the costs of devices. (goodereader.com)
Harlow admits that physical text option may be... (newgadget.org)
It seems the only answer is that we can never know with any certainty what the «Bible» (as the concept, not the physical text on your coffee table) is actually saying. (nakedpastor.com)