I wonder if part of the problem with staff awareness is that a lot of passengers in central London are, and are employed as experienced information workers, and that may be their primary function in their current job. This also extends to the social media teams at TOCs.
Train dispatch and gateline staff are not necessarily skilled information workers. Their job is not primarily to process and disseminate large amounts of information from potentially contradictory and fast moving textual and numerical feeds, so they may not be as adept at doing it as the passengers themselves. Particularly for train dispatch, an eagle-eye on the train-platform interface, and being able to enact rare parts of the rule book automatically, are far more important skills, as this will keep passengers from being maimed or killed.
Therefore it is really up to the TOCs to have people at key hubs/control, with access to station CCTV, internal industry systems, a weather eye over control's ability to call on trains and staff, and an ability to quickly disseminate timely information. These people can be employed as information workers and have the right skill set. I'm not sure the TOCs have this right now.
Perhaps an alternative is an internal 'Twitter' like system allowing 2 way information flow to such an officer from the bodies on the ground.