Even though message boards aren't as active as say, 10 years ago, I don't quite understand the decision. It shouldn't be that expensive for them and if it was an issue, just delete all posts from 5+ years ago. For website that wants to "connect" Columbus residents and visitors to the best Cbus has to offer, it seems like they are eliminating their best platform to do just that.
Perhaps like the messageboards, CU has outlived its useful life. They aren't really doing anything unique from a local journalism perspective (mostly just puff pieces on local projects, restaurants, etc.) and with facebook events and other social media, their event calendar isn't entirely unique anymore. I'm not sure what I'm getting from CU now that I can't just get elsewhere. The messageboard had been a place I could discuss and interact with other people about all things Columbus. That's why I decided to register here :)