How about for discussiony questions that come up on the main sites there could be a 'Migrate to Chat' close reason, and a room there to receive them? Kind of like stackoverflowoverflow was, but triggered though a close-migration process.
The stub would just have to point to the room, since it's probably not easy to link to a specific place in chat.
We could call the room, the Question Graveyard.
This might help get rid of the Discussion pressure that new users keep bringing to bear.