We recently had our main chat room frozen on the DIY site because we're not that talkative. I'd suggest a feature to allow moderators to explicitly protect chatrooms that would exclude them from these automatic freezing and deletion routines so that discussions appropriate for this forum have a place to go.
Support. The main chatroom for robotics.stackexchange.com (http://chat.stackexchange.com/rooms/6221/asimovs-corner) was frozen for 38 days in 2015. As I didn't have anything specific to say, it seemed rude to hunt for a mod chat room to ask a mod to unfreeze it.