Petition!
https://www.change.org/p/imdb-stop-imdb-from-disabling-the-message-boards
Help save the boards!!
I'm not getting my hopes up or anything, but I signed. I think the boards are truly a valuable resource and that they'll regret getting rid of them.
ETA: I also signed this one https://www.ipetitions.com/petition/petition-to-keep-the-imdb-messageboards-going#
"Please eat the foot."