There is no stopping these boards
From shutting down so why not try these?
Not as good as IMDB but at least you can have discussions with other people. Here are some of them.
http://nytramsplace.activeboard.com/
http://area51.boardhost.com/
http://thegotboard.com/
http://imdb2.freeforums.net/
https://www.imdforums.com/
My guess is if enough people from IMDB sigh up for these sites they will only get better. If you like message boards it is better than nothing.