Could be a paradigm shift
I've had a Kindle Keyboard (old one with WiFi/3G) for years, and continue to be quite happy with it. Works great in full tropical sunlight and in Canadian winter indoors.
I would be happy to buy a colour device with similar characteristics. Maybe add a touch screen. It would be nice to see the book covers in the same full colour as you get on the physical books.
Think about this: the contents of books is black and white, mostly because it costs quite a bit more to do colour printing, I'd guess. What if there were a market for coloured book contents? Would publishers then start putting colour in? Many books used to have occasional pictures in them. It would be nice to have those in colour. What about colour in the chapter headers, etc.? I think it could change things, over time.