What about mailing lists on a per building level? Ironically, one of the reasons I was caught flat footed was that uptime is generally so good. I've been doing this job for over 4 years , and this is the first incident I can remember wherein we've had planned downtime so close to working hours. Typically if it has happened in the past, it has been at odd hours, or over Christmas break, etc. After this, I may very well subscribe to the service status list, but history suggests that prior to this, 99.9% of what I would have seen up until yesterday wouldn't have impacted me.
Another consideration is that there are many departments on campus who don't have dedicated IT staff. It would make sense for those people to receive warnings about downtimes that would directly impact them, but they obviously wouldn't care about anything else.