eInk still costs far too much per unit area. You can buy wall sign sized eInk displays, but they'll cost much more than an LCD TV panel of the same size. 32" diagonal display, $3,599.[1] Compare 32 inch color LCD TVs for $200 at WalMart. Despite talk of cheap "electronic paper" displays, the eInk people never delivered on cost.
[1] https://www.visionect.com/product/visionect-development-kit-...