Maybe they could bake a warning about the use of deprecated features into the default MOTD or some other system alert? Something like: "Hey, we are considering

Maybe they could bake a warning about the use of deprecated features into the default MOTD or some other system alert? Something like: "Hey, we are considering deprecating 'ls -P' and detected its use by your system. We'd love to work with you to ensure a smooth transition, check out 'man depwarn3754' for details on how you can help." The man page could include a notice about why they want to deprecate it, how you can get away from using it, and, how to contact them if you think it's an issue. It'd be a lot of leg work, that's for sure.