I feel like the real opportunity for e-ink displays is white boards. I would love a 4 ft x 3 ft e-ink display that I could mount on the wall with calendar and note widgets and that I could also draw on like a white board.

Plus, remote teams would really benefit from a shared whiteboard device. A device with infinite scroll in both directions and shared editing. I mean, really adding infinite scroll and collaborative editing to existing remarkable devices would cover that use case.