It won't happen until e-ink gets a similar scale of production - E-Ink is niche, because it's basically never better than LCDs and is more expensive, so it's only used in e-readers, supermarket tags, and nowadays e-notes, all of which are incredibly niche. This might change if E-Ink corp's fast multi-dye color tech ACeP/Gallery 3) takes off in a big way, but I wouldn't hold my breath.