The "split-flap" display sign is not dead. It's being reimagined as public art.

You may have read about the untimely demise of Amtrak's flip-board train information sign in Philadelphia. It was removed last month, the last one of its kind in the US. But there's a small company called Oat Foundry in Philadelphia that still manufactures "split-flap" display boards and they are being installed in restaurants, public spaces, and as interactive art projects (with an app for posting messages). Here’s a video.