Digital books (on e-paper anyway) cannot yet handle the range of colors paper can. OLED can do this much better than paper but it also requires much more energy

Digital books (on e-paper anyway) cannot yet handle the range of colors paper can. OLED can do this much better than paper but it also requires much more energy than e-paper. Long term I wonder how long digital books will last. After the apocalypse paper books will still be readable but will we have the devices, the batteries, the Internet-connected DRM systems etc to read digital books? All that said I still buy mostly e-books when color doesn't matter. I used to own a printing business, so I feel some nostalgia about paper books, but the sheer tonnage of paper books in my house is threatening to condense into a mini black hole, so e-books it is for me from now on.