I remember after the Line 2 (then called the Bloor-Danforth Subway) opened on the Saturday, February 26, 1966, on the Monday, crowds of people still went and stood at the streetcar stops on Bloor Street or Danforth Avenue to wait for a streetcar that never came. You may have all the signs, radio & television & newspaper announcements, and talk, people will still not know what is happening.
As a GO Transit Station Attendant, I witness this often. For example, take a weekend service reduction or closure where rail is cancelled for a construction project. No matter how much Metrolinx communicates via Twitter posts, posts on the GO Transit website, on board announcements a full week before the closure and communication via traditional media (CP 24, 680 News etc.) there will always be people showing up at affected stations wondering where the train is.Short of personally stopping each person and speaking to them directly, there will be plenty of people still ignorant to the new reality.