The shutdown date has been available for some time, giving anyone who was still relying on the service a chance to fetch any data they wanted and make plans to move on. There's no mention of just how many people still used the service, though I imagine it wasn't very many. Numbers aside, there's still a feeling of nostalgia I get when thinking about GeoCities. For many of us, it was one of the most common first experiences on the Internet, and was one of the first services that ever tried to cater to neophyte web users who wanted to make a name for themselves.
Yahoo is offering to migrate any existing users over to their hosted services. Their disposal of GeoCities is part of their greater plan to improve company profits, which has been an important concern after a series of failed mergers and service cuts.