So sending me an FB message is now a black hole and I'm fine with that. FB's decision just pushed me and all other similar users (users that already are on the fringes of FB usage, using it only rarely) even further away.
I'm not sure if that's a bad thing or good thing for them, since honestly I don't know what FB could do alternately to win back people in my "barely use FB" demographic, and from comments here it does seem like people who actually use FB regularly did not share my reaction ("screw it then") and instead felt forced to install the app and move on with their lives.